Finding the Fourth Proportional to 101,397.25, 139,929.42 and 56,078.97

Step by Step Solution

1. Step 1: Write the proportion equation
   101,397.25 : 139,929.42 = 56,078.97 : x
2. Step 2: Convert to fraction form
   101,397.25/139,929.42 = 56,078.97/x
3. Step 3: Cross multiply
   101,397.25x = 139,929.42 × 56,078.97
4. Step 4: Simplify right side
   101,397.25x = 7,847,097,746.30
5. Step 5: Solve for x
   x = 7,847,097,746.30/101,397.25
6. Step 6: Final answer
   x = 77,389.65