It will depend on what the company consider a full-time week. That can be any number of hours, often between, say 36 and 40 (some have more than that).
Let's say it's 37. Then the pro-rata earnings would be 30/37 of �12,177. Divide 12,177 by 37, then multiply your answer by 30. I make it approx. �9784.
I'm not mathematical genius, though, so I'm willing to be corrected.