Finding the Fourth Proportional to 101,117, 139,545.78 and 56,405

Step by Step Solution

1. Step 1: Write the proportion equation
   101,117 : 139,545.78 = 56,405 : x
2. Step 2: Convert to fraction form
   101,117/139,545.78 = 56,405/x
3. Step 3: Cross multiply
   101,117x = 139,545.78 × 56,405
4. Step 4: Simplify right side
   101,117x = 7,871,079,720.90
5. Step 5: Solve for x
   x = 7,871,079,720.90/101,117
6. Step 6: Final answer
   x = 77,841.31