Question

The angle in a quadrilateral abcd are such the angle d is fourth proportional of angle a, b and c. If the angles b and a is 7:4, and angle d is 154 ĚŠ , find the measure of angle c?

Answer 1

${8 {8 {7445? \times \frac{?}{?} \times \frac{?}{?} }^{?} }^{?} }^{?}$