Interpolation out of table

Hello and I thank you all who have put your efforts to solve my question.
I must however apologize, not being clear enough first.
The given table is constructed so, that the first uppermost row is value for ratio d/b, and the leftmost column is for value lambda.
These values are not part of data. They are and must be used as parameters to function.

The result must be found from table 1,1 .. 9,4.(Origin 0)
For example when d/b = 7 and lambda is 3, result is 1.38, and if d/b = 1 and lambda = 2, result is interpolated to be 1.33.
So when d/b = 1.5 and lambda=7, I get something like 1.28 by hand calculation.
I interpolated total 8 values, two in 1.5 on rows 3 and 10 and two in 7 on columns 1 and 2.
Then interpolated horizontal, vertical and diagonals values in the middle and finally took mean out of these four.

This programming is what I am going to do. I can easily do it using "basic" and "VB"; "lisp" and "fortran", but this Mathcad is a bit strange still, however I have been reading this forum for quite a long time since joining.
Not even remember any more, when I first wrote here complaining about vlookup-function ;>)

Cheers Matti