Assume you have a portfolio consisting of only three shares X$,$ Y and Z with expected returns of $27\mathrm{.}01\%,17\mathrm{.}08\%$ and $9\mathrm{.}11\%$ respectively. Your portfolio weights in this instance are $23\mathrm{.}3\%$ in security X and $37\mathrm{.}76\%$ in security Y$.$ By finding the portfolio weight in security Z$,$ hence find the expected return on this portfolio.