Hey, I did my masters in Computational Solid Mechanics where I wrote the Finite Element Code initially in Matlab because coding in matlab is easy and prototypes can be built fast there. Later I realized that the matlab code was taking days to run, so I converted that to C++ for achieving performance in terms of speed.
Your problem is exactly opposite to what I did. You need conversion from FORTRAN, a low level language to MATLAB, a high level language.
I can definitely help here as I have done that myself. Let's discuss more over chat.
Bid is negotiable depending on how much coding is required!