Find The Latest Row

I've got a multi column sheet containing, amonst other headings, "Date", "Transaction" and then a rolling "Balance". I have multiple rows with the same date and what I'm simply trying to do is have a formula at the top of my spreadsheet that finds the very last row that has data entered so that I can then extract & display the balance as at that point.

Date / Transaction / Value / Balance
01-12-09 / Salary / +£1,000 / +£2,600
01-12-09 / Fuel / -£50 / +£2,550
01-12-09 / Gift / -£100 / +£2,450
03-12-09 / Food / -£30 / +£2,420
03-12-09 / Interest / +£2 / +£2,422

In this example I'd want to return row 5 and then do some kind of lookup to retrieve the value £2,422...