Create stock table

Question

I need to create query for last stock quantity. It should be very easy but I dont know where to start.
I have 3 tables. Stores, Dates and Transactions. I want to combine all Stores with all Dates in one table and then calculate Last Stock Quantity.
Stores
London
Paris
Prague
Dates
1.1.2014
2.1.2014
3.1.2014
Transactions
1.1.2014 London 1000
1.1.2014 Paris 1300
1.1.2014 Prague 1500
2.1.2014 London 800
3.1.2014 Prague 1200
And result should look like this Last_Quantity should be Quantity for last date in Transactions table.
1.1.2014 London 1000
1.1.2014 Paris 1300
1.1.2014 Prague 1500
2.1.2014 London 800
2.1.2014 Paris 1300
2.1.2014 Prague 1500
3.1.2014 London 800
3.1.2014 Paris 1300
3.1.2014 Prague 1200

Answer 1

I have created a full example:
CREATE TABLE STORES (Name VARCHAR(MAX))
CREATE TABLE DATES (Date DATE)
CREATE TABLE Transactions (DATE date, Store varchar(max), Quantity INT)
INSERT INTO STORES values ('London'), ('Paris'), ('Prague')
insert into dates values ('2014-01-01'),('2014-01-02'),('2014-01-03')
insert into Transactions values ('2014-01-01','London',1000)
insert into Transactions values ('2014-01-01','Paris',1300)
insert into Transactions values ('2014-01-01','Prague',1500)
insert into Transactions values ('2014-01-02','London',800)
insert into Transactions values ('2014-01-03','Prague',1200)
SELECT Stores.Name, Dates.Date, (SELECT TOP 1 Transactions.Quantity FROM Transactions WHERE Transactions.Date <= Dates.Date AND Transactions.Store = Stores.Name ORDER BY Transactions.Date DESC)
FROM Stores CROSS JOIN Dates