Finding the Fourth Proportional to 62,456.78, 86,166.15 and 39,791.72

Step by Step Solution

1. Step 1: Write the proportion equation
   62,456.78 : 86,166.15 = 39,791.72 : x
2. Step 2: Convert to fraction form
   62,456.78/86,166.15 = 39,791.72/x
3. Step 3: Cross multiply
   62,456.78x = 86,166.15 × 39,791.72
4. Step 4: Simplify right side
   62,456.78x = 3,428,698,883.45
5. Step 5: Solve for x
   x = 3,428,698,883.45/62,456.78
6. Step 6: Final answer
   x = 54,897.14