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how do you use this in a calculation?

When trying to solve for gravitational force exerted between two objects, you need a M1 & M2. If the M2 is the mass of earth, how do you solve it?

M1 = 48.5 kg

M2 = 5.9742 × 1024 kg

distance between objects (r) = 11712.137

I have the numbers, but don't know what to do with the "earth mass".