Finding the Fourth Proportional to 129,665.97, 178,942.20 and 72,304.73

Step by Step Solution

1. Step 1: Write the proportion equation
   129,665.97 : 178,942.20 = 72,304.73 : x
2. Step 2: Convert to fraction form
   129,665.97/178,942.20 = 72,304.73/x
3. Step 3: Cross multiply
   129,665.97x = 178,942.20 × 72,304.73
4. Step 4: Simplify right side
   129,665.97x = 12,938,367,456.61
5. Step 5: Solve for x
   x = 12,938,367,456.61/129,665.97
6. Step 6: Final answer
   x = 99,782.29