Not much info on this colour, only this partial PMS Bridge listing.
RGB 99,153,174 (but the listing doesn't specify which RGB, so you'll have to figure that out. Unlikely to be anything other than sRGB or AdobeRGB though.)
CMYK 56,9,9,21 (again, doesn't specify which CMYK, but unlikely to be anything other than US Web Coated SWOP or FOGRA39... so try those numbers in each and see what works.)
But I suspect you're after the recipe for ink mixing, and I'm from a different world I'm afraid