How do I get the weights of all 3 stocks then combine it into a portfolio. Then combining it with a risk free asset worth 0.002% with the total portfolio having a total standard deviation of 2%

% Weight Stock1 % Weight Stock 2 E(r) STDEV Sharpe Ratio 0.688833028 0.311166972 0.000408261 0.0270595 0.014348418 % Weight of above portfolio % Weight stock 3 E(r) STDEV Sharpe Ratio 0.556242047 0.443757953 0.000438698 0.0276335 2% risk free asset 0.002% % Weight Stock1 % Weight Stock 2 E(r) STDEV Sharpe Ratio 0.688833028 0.311166972 0.000408261 0.0270595 0.014348418 % Weight of above portfolio % Weight stock 3 E(r) STDEV Sharpe Ratio 0.556242047 0.443757953 0.000438698 0.0276335 2% risk free asset 0.002%