How to find GPS coordinates of a known distance from a known gps location? -

i need know method find gps coordinates of unknown point. following scenario.

i know gps coordinates of location a. want find gps coordinates of location b(unknown) known d distance location a. (i know direction of location b) grateful if please me this. in advance, hasala

either use polar coordinates, first transforming cartesian (x,y) coordinates, , spheric, or use formula: