Finding the Fourth Proportional to 90,285.96, 135,126.76 and 89,091.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90,285.96 : 135,126.76 = 89,091.15 : x
2. Step 2: Convert to fraction form
   90,285.96/135,126.76 = 89,091.15/x
3. Step 3: Cross multiply
   90,285.96x = 135,126.76 × 89,091.15
4. Step 4: Simplify right side
   90,285.96x = 12,038,598,444.17
5. Step 5: Solve for x
   x = 12,038,598,444.17/90,285.96
6. Step 6: Final answer
   x = 133,338.54