searching multiple columns to return a value from a different column

for example, i want to reference the two values at the bottom and return whats in in the 5th column from the table. So in this istance i would want to return 12.2 to appear in the cell. If the 2 was 2.5 i would want to return 9.8


9.625 2 1.5 1.5 12.2
9.625 2.5 1.5 1.5 9.8
9.625 3 1.5 1.5 8.2
7 2 1.2 1.2 8.6
7 2.5 1.2 1.2 6.8
7 3 1.2 1.2 5.1




9.625
2

See attached. Note that it's not ideal as it relies on the values always appearing in the first two columns, entered in order, and references a concatenated column I added. I'm sure there's a more elegant way to do this.