Automatically Updating Cells

I am going to try to be as detailed as I can here:

I have been manually inputting the most recent "paid to date" field from one sheet to another within the same workbook.

There are about 20 different payment schedules for each deal. Each of these has their own sheet, and we will call this the "Deal" sheet. Some deals are paid based on a monthly schedule, some are quarterly, and others are annual.

The "deal" sheet looks like this:

Due Date Payment Payment Rcvd Remng Payment Payment Date
8/31/08 $10,000.00 $10,000.00 $0.00 08/1/08
9/31/08 $10,000.00 $10,000.00 $0.00 09/1/08
10/31/08 $10,000.00 $10,000.00 $0.00 10/1/08
11/31/08 $10,000.00 $10,000.00 $0.00 11/1/08
12/31/08 $10,000.00 $10,000.00 $0.00 12/1/08
1/31/08 $10,000.00 $0 $10,000.00

I want to have a macro that will paste the most recent "Due date" based on a zero value in the "Remng Payment" column. For this example, the most recent "Due Date" should be 12/31/08 because that is the most recent zero value.

I want to past this value in another worksheet that contains a report for all 20 deals. Lets call this the "Reports" worksheet. Each of these dates individual deals needs to be applied to its respective row on the "Reports" worksheet in a "Paid to Date column.