Finding the Fourth Proportional to 101,213.50, 139,674.64 and 56,501.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,213.50 : 139,674.64 = 56,501.50 : x
2. Step 2: Convert to fraction form
   101,213.50/139,674.64 = 56,501.50/x
3. Step 3: Cross multiply
   101,213.50x = 139,674.64 × 56,501.50
4. Step 4: Simplify right side
   101,213.50x = 7,891,826,671.96
5. Step 5: Solve for x
   x = 7,891,826,671.96/101,213.50
6. Step 6: Final answer
   x = 77,972.08