It's a simple division problem: 1230 / 18565 = 0.0663. The answer may be converted from one metric to the next to get 6.63 such as from m to cm. So, look for any metric conversions.
It's most likely asking for a percentage. So just divide 1230 by 18565 and multiple the number you get by 100%. Don't forget to put the % sign in your answer.