Finding the Fourth Proportional to 78,540.29, 108,387.90 and 42,732.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,540.29 : 108,387.90 = 42,732.60 : x
2. Step 2: Convert to fraction form
   78,540.29/108,387.90 = 42,732.60/x
3. Step 3: Cross multiply
   78,540.29x = 108,387.90 × 42,732.60
4. Step 4: Simplify right side
   78,540.29x = 4,631,696,561.88
5. Step 5: Solve for x
   x = 4,631,696,561.88/78,540.29
6. Step 6: Final answer
   x = 58,972.24