Finding the Fourth Proportional to 92,680.50, 137,828.46 and 89,728.02

Step by Step Solution

1. Step 1: Write the proportion equation
   92,680.50 : 137,828.46 = 89,728.02 : x
2. Step 2: Convert to fraction form
   92,680.50/137,828.46 = 89,728.02/x
3. Step 3: Cross multiply
   92,680.50x = 137,828.46 × 89,728.02
4. Step 4: Simplify right side
   92,680.50x = 12,367,074,815.45
5. Step 5: Solve for x
   x = 12,367,074,815.45/92,680.50
6. Step 6: Final answer
   x = 133,437.72