You may have correctly set up the problem as $\displaystyle{4}\frac{{3}}{{4}}\div{38}\usepackage{cmbright}\Huge\$ . However, you multiplied the reciprocal of $\displaystyle{4}\frac{{3}}{{4}}\usepackage{cmbright}\Huge\$ by 38 instead of multiplying $\displaystyle{4}\frac{{3}}{{4}}\cdot\frac{{1}}{{38}}\usepackage{cmbright}\Huge\$ to get the answer.