A mass of 6 kg lies on a horizontal, frictionless floor. A force of 85 Newtons pushes to the left (negative x direction) with a force of 85 Newtons. Another force of unknown magnitude pushes the mass in a direction of 27.8 degrees above the positive x axis. The mass is originally at rest before these forces are applied and 2.3 seconds after the forces have been applied, the mass has moved to the left a distance of 13.4 meters. What is the magnitude of the unknown force in Newtons?