Solving a multi-var equation of matrices

I am trying to get a matrix of numeric answers for a single variable in a multi-variable equation. The equation can't be rearranged symbolically for the variable in question. My desire is to input a matrix of values for two of the three variables, and get out a single-column matrix (array?) of values for the last variable.

Attached you'll find the equation and a subset of the data I'm trying to work with (there are hundreds of data points). Page two is a failed attempt to try it in a solve block (tried both Find() and Minerr() operands). [MathCad 2001i, Windows 2000 - I have access to MathCad 14 on a Windows XP machine if necessary]

~Jon