Finding the Fourth Proportional to 100,839.50, 139,158.51 and 56,126.54

Step by Step Solution

1. Step 1: Write the proportion equation
   100,839.50 : 139,158.51 = 56,126.54 : x
2. Step 2: Convert to fraction form
   100,839.50/139,158.51 = 56,126.54/x
3. Step 3: Cross multiply
   100,839.50x = 139,158.51 × 56,126.54
4. Step 4: Simplify right side
   100,839.50x = 7,810,485,677.86
5. Step 5: Solve for x
   x = 7,810,485,677.86/100,839.50
6. Step 6: Final answer
   x = 77,454.63