Finding the Fourth Proportional to 99,127.50, 136,705.20 and 65,122.50

Step by Step Solution

1. Step 1: Write the proportion equation
   99,127.50 : 136,705.20 = 65,122.50 : x
2. Step 2: Convert to fraction form
   99,127.50/136,705.20 = 65,122.50/x
3. Step 3: Cross multiply
   99,127.50x = 136,705.20 × 65,122.50
4. Step 4: Simplify right side
   99,127.50x = 8,902,584,387
5. Step 5: Solve for x
   x = 8,902,584,387/99,127.50
6. Step 6: Final answer
   x = 89,809.43