Finding the Fourth Proportional to 101,101.50, 139,520.07 and 56,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,101.50 : 139,520.07 = 56,389.50 : x
2. Step 2: Convert to fraction form
   101,101.50/139,520.07 = 56,389.50/x
3. Step 3: Cross multiply
   101,101.50x = 139,520.07 × 56,389.50
4. Step 4: Simplify right side
   101,101.50x = 7,867,466,987.27
5. Step 5: Solve for x
   x = 7,867,466,987.27/101,101.50
6. Step 6: Final answer
   x = 77,817.51