Not only that, but modern compilers are insanely good at compiling numerical Fortran code. The very first optimizing compiler was for Fortran and it's consistently been on the forefront of compiler techniques ever since.
I know that's the cliche, but I don't think that something like VSOP87 would be noticeably faster compiled with Fortran vs. C, in the early 90s. If there even was a Fortran compiler available for Mac or Amiga, it was probably priced obscenely, too.