Finding the Fourth Proportional to 101,116.50, 139,540.77 and 56,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,116.50 : 139,540.77 = 56,404.50 : x
2. Step 2: Convert to fraction form
   101,116.50/139,540.77 = 56,404.50/x
3. Step 3: Cross multiply
   101,116.50x = 139,540.77 × 56,404.50
4. Step 4: Simplify right side
   101,116.50x = 7,870,727,361.47
5. Step 5: Solve for x
   x = 7,870,727,361.47/101,116.50
6. Step 6: Final answer
   x = 77,838.21