Finding the Fourth Proportional to 92,892.40, 139,630.20 and 91,142.80

Step by Step Solution

1. Step 1: Write the proportion equation
   92,892.40 : 139,630.20 = 91,142.80 : x
2. Step 2: Convert to fraction form
   92,892.40/139,630.20 = 91,142.80/x
3. Step 3: Cross multiply
   92,892.40x = 139,630.20 × 91,142.80
4. Step 4: Simplify right side
   92,892.40x = 12,726,287,392.56
5. Step 5: Solve for x
   x = 12,726,287,392.56/92,892.40
6. Step 6: Final answer
   x = 137,000.31