A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a $m_1 = 1.9$-kg object at the origin of the coordinate system, a $m_2 = 3.3$-kg object at (0, 2.0), and a $m_3 = 5.2$-kg object at (4.0, 0). Find the resultant gravitational force exerted by the other two objects on the object at the origin.