How do I determine memory requirements?

A development team asked me to determine memory requirements for Oracle Portal 10.1.4 implementation. I don't know how to do that, since I am not a software engineer or a systems analyst. The assumptions are: 1.) 6,000 users at peak, with incremental build out over a 24 month period, 2.) about 1,000 users that are actively submitting requests at any one time through their browsers (generating actual load on the servers), 3.) total storage usage for the portal is approximately 5 gigabytes, and 4.) OracleAS 10g architecture (with infrastructure and middle tier servers) would be the proposed HA architecture. 5.) access to the portal would be 18 hours per day, possibly 24 hours a day for a period of 4 months.
How would I estimate the memory requirements for access and storage for this critical mission portal?

http://www.oracle.com/technology/products/ias/portal/pdf/oow_10gr2_1337_pepper.pdf

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How do you determine memory requirements

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iMac (21.5-inch, Late 2009) (Technical Specifications)
iMac - model: iMac10,1
1 3.06 GHz Intel Core 2 Duo CPU: 2-core
12 GB RAM Upgradeable
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BANK 1/DIMM0
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System Software: ℹ️
OS X 10.10.1 (14B25) - Time since boot: 1:8:36
Disk Information: ℹ️
WDC WD5000AAKS-40V2B0 disk0 : (500.11 GB)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 499.25 GB (398.65 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
PIONEER DVD-RW DVRTS09
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Apple Inc. Built-in iSight
Apple Internal Memory Card Reader
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
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Mac App Store and identified developers
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[loaded] com.google.keystone.agent.plist [Support]
[loaded] com.symantec.errorreporter-periodicagent.plist [Support]
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Flash Player: Version: 16.0.0.257 - SDK 10.6 [Support]
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Flip4Mac WMV [Support]
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Total size: 1.00 TB
Total number of backups: 15
Oldest backup: 2013-08-01 22:49:49 +0000
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      0% launchservicesd
Top Processes by Memory: ℹ️
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322 MB SymDaemon
206 MB Google Chrome
168 MB spindump
155 MB mds_stores
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1.51 GB Inactive RAM
1.05 GB Wired RAM
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0 B Page-outs
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