Finding the Fourth Proportional to 91,084.91, 135,721.88 and 81,147.83

Step by Step Solution

1. Step 1: Write the proportion equation
   91,084.91 : 135,721.88 = 81,147.83 : x
2. Step 2: Convert to fraction form
   91,084.91/135,721.88 = 81,147.83/x
3. Step 3: Cross multiply
   91,084.91x = 135,721.88 × 81,147.83
4. Step 4: Simplify right side
   91,084.91x = 11,013,535,265.48
5. Step 5: Solve for x
   x = 11,013,535,265.48/91,084.91
6. Step 6: Final answer
   x = 120,915.04