Is it possible to embed a conditional statement inside of a VLOOKUP formula?
For example, if I have the following data:

"Stage" "Date" "Revenue" "Term" "WeightedValue"
Closed Jan $4,500,000 3 $337,500
Verbal Feb $1,200,000 1 $174,545
Proposal Mar $973,800 3 $12,984
Proposal Mar $2,300,000 3 $30,667
Qualif May $1,000,000 1 $-
Qualif Jul $1,000,000 1 $-
Proposal Feb $60,000,000 5 $872,727
Qualif Mar $336,000 1 $3,360
Qualif Feb $40,000 1 $727

My objective is to sum the "WeightedValue" for each row that matches the
following criteria:

1 - Stage = Proposal
2 - Date = Feb

Thank you,
Raphael