The point of support of a lever of 4M is situates has 3M end of the arm of lever. Which force it is necessary to apply to raise a load of 600 N?

We do not do homework for you but can help you figure out your own answer. Your description is a bit weak so tell us if this is a 1st class lever, 2nd class or what. BTW the term is not point of support its pivot point or fulcrum