Help pleasee I have no idea what im doing

Umm.. just started this 2day and its not on my notes(p′︵‵。)

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

597008.439431 to the nearest thousand