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First, you need to find the volume of the metal.
V = 4/3 πr³ = 4/3 π(0.25)³

Density is equal to g/cm³ or kg/m³. Therefore, the density of the metal is
503 kg /[4π(0.25)³ /3] m³    <--Let this be equal to d

The specific gravity (SG) is the ratio of its density to water. The density of water is 1000kg/m³.  <--I'll let this equal to w

So, SG = d/w  <--just plug in the values you computed

Note: Sorry I don't have a calculator with me