A person's foot (mass = 1.019 kg) is in contact with the ground and the ground reaction force is -72 in the x direction and 778 in the y direction....

A person's foot (mass = 1.019 kg) is in contact with the ground and the ground reaction force is -72 in the x direction and 778 in the y direction. The person's leg segment has a mass of 3 kg. The foot and leg are at static equilibrium. What is the x component of the joint reaction force at the knee (with respect to the leg segment).