Need a simple Excel Index Match function created

Closed - This job posting has been filled and work has been completed.
Fixed Price
Deliver by - July 22, 2013
10
Budget

Details

Sheet B has 4 columns.  I want to search those columns from values in Sheet A.  If columns 1-3 in sheet A match any row in sheet B, then return column 4 from Sheet B.

Need this done today.