Finding the Fourth Proportional to 101,332.72, 139,838.88 and 56,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   101,332.72 : 139,838.88 = 56,620.72 : x
2. Step 2: Convert to fraction form
   101,332.72/139,838.88 = 56,620.72/x
3. Step 3: Cross multiply
   101,332.72x = 139,838.88 × 56,620.72
4. Step 4: Simplify right side
   101,332.72x = 7,917,778,069.59
5. Step 5: Solve for x
   x = 7,917,778,069.59/101,332.72
6. Step 6: Final answer
   x = 78,136.44