Simple Stats Help!!

I am trying to prove the statistical difference (or indifference) of two proportions, each with a different sample size. I simply forget how! Specifically, I am trying to determine if 4/13 (30.8%) is statistically different from 15/54 (27.8%). My gut tells me they are not statistically different based on the small sample size of 13 for one of the proportions. Any help reminding me of this test would be much appreciated!!

Thanks!!

anybody?? please....a little help??

Thanks