Finding the Fourth Proportional to 89,723.50, 133,526.15 and 86,733.69

Step by Step Solution

1. Step 1: Write the proportion equation
   89,723.50 : 133,526.15 = 86,733.69 : x
2. Step 2: Convert to fraction form
   89,723.50/133,526.15 = 86,733.69/x
3. Step 3: Cross multiply
   89,723.50x = 133,526.15 × 86,733.69
4. Step 4: Simplify right side
   89,723.50x = 11,581,214,847.91
5. Step 5: Solve for x
   x = 11,581,214,847.91/89,723.50
6. Step 6: Final answer
   x = 129,076.72