Finding the Fourth Proportional to 101,211.50, 139,671.88 and 56,499.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,211.50 : 139,671.88 = 56,499.50 : x
2. Step 2: Convert to fraction form
   101,211.50/139,671.88 = 56,499.50/x
3. Step 3: Cross multiply
   101,211.50x = 139,671.88 × 56,499.50
4. Step 4: Simplify right side
   101,211.50x = 7,891,391,384.06
5. Step 5: Solve for x
   x = 7,891,391,384.06/101,211.50
6. Step 6: Final answer
   x = 77,969.32