Finding the Fourth Proportional to 15,658.59, 21,609.72 and 9,288.96

Step by Step Solution

1. Step 1: Write the proportion equation
   15,658.59 : 21,609.72 = 9,288.96 : x
2. Step 2: Convert to fraction form
   15,658.59/21,609.72 = 9,288.96/x
3. Step 3: Cross multiply
   15,658.59x = 21,609.72 × 9,288.96
4. Step 4: Simplify right side
   15,658.59x = 200,731,824.69
5. Step 5: Solve for x
   x = 200,731,824.69/15,658.59
6. Step 6: Final answer
   x = 12,819.28