Number of members in every year need to be calculated.
Starting member numbers = 450
In Year 1, members = 450 * (1 + 27%) = 571.500000
In Year 2, members = 572 * (1 + 27%) = 725.805000
In Year 3, members = 726 * (1 + 22%) = 885.482100
In Year 4, members = 885 * (1 + 18%) = 1044.868878
Answer = 1,045