Finding the Fourth Proportional to 90,865.95, 136,321.61 and 89,359.17

Step by Step Solution

1. Step 1: Write the proportion equation
   90,865.95 : 136,321.61 = 89,359.17 : x
2. Step 2: Convert to fraction form
   90,865.95/136,321.61 = 89,359.17/x
3. Step 3: Cross multiply
   90,865.95x = 136,321.61 × 89,359.17
4. Step 4: Simplify right side
   90,865.95x = 12,181,585,475.87
5. Step 5: Solve for x
   x = 12,181,585,475.87/90,865.95
6. Step 6: Final answer
   x = 134,061.06