homework and exercises - Balancing Orthogonal Forces on 2D plane with arbitrary placement

I have a rectangular block in the xy plane with the center of mass that acts in the z direction at an arbitrary place in the plane. I also have 4 legs that support this weight underneath the block. The system is at equilibrium and not moving. These 4 legs can also be arbitrarily placed. The forces on each leg might obviously not be equal based on placement. How do I solve for the force on each leg? I would like a general formula based off the x and y locations of the legs and the center of mass. The Weight of the block will be given.