Question

A charge of -3.5 µC is located at the origin; a charge of 4.66666666666667 µC is located at x = 0.2 m, y = 0; a third charge Q is located at x = 0.32 m, y = 0. The force on the 4.66666666666667 µC charge is 326.666666666667 N, directed in the positive x direction.
Q = -113.181µC

With this configuration of three charges, where, along the x direction, is the electric field zero?