Finding the Fourth Proportional to 90,788.72, 136,245.72 and 31,624.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90,788.72 : 136,245.72 = 31,624.88 : x
2. Step 2: Convert to fraction form
   90,788.72/136,245.72 = 31,624.88/x
3. Step 3: Cross multiply
   90,788.72x = 136,245.72 × 31,624.88
4. Step 4: Simplify right side
   90,788.72x = 4,308,754,545.51
5. Step 5: Solve for x
   x = 4,308,754,545.51/90,788.72
6. Step 6: Final answer
   x = 47,459.14