A charge, q1, of +17 micro-coulombs is located at x = 0, y = 6.3 cm, a charge q2of -43 micro-coulombs is located at x = 0, y = -4 cm, an unknown...

A charge, q1, of +17 micro-coulombs is located at x = 0, y = 6.3 cm, a charge q2 of -43 micro-coulombs is located at x = 0, y = -4 cm, an unknown charge of q3, is located at x =- 5.6 cm, y = 0 cm, and a charge, q4, -7 micro-coulombs is located at x = +16.9 cm, y = 0 cm. The direction of the total electric force on q4 is 130.4 degrees from the +x axis, counter-clockwise. What is the unknown charge, q3, in micro-coulombs? If negative, include a negative sign in your answer.