The center of mass of an irregularly shaped platform is balanced on a pivot Point P with coordinates (7.0 m, 1.0 m). Two rocks are then placed on top of the platform, as shown in the top view. One rock has a mass of 1.0 kg and is located at (−2.0 m, −3.0 m), and the second rock has a mass of 3.0 kg and is located at (5.0 m, 4.0 m). At which coordinates should a third rock of mass 4.0 kg be placed such that the three rock-platform system is balanced?