Finding the Fourth Proportional to 100,836.72, 139,153.32 and 56,124.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,836.72 : 139,153.32 = 56,124.72 : x
2. Step 2: Convert to fraction form
   100,836.72/139,153.32 = 56,124.72/x
3. Step 3: Cross multiply
   100,836.72x = 139,153.32 × 56,124.72
4. Step 4: Simplify right side
   100,836.72x = 7,809,941,122.07
5. Step 5: Solve for x
   x = 7,809,941,122.07/100,836.72
6. Step 6: Final answer
   x = 77,451.36