Finding the Fourth Proportional to 100,826, 139,139.88 and 56,124.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100,826 : 139,139.88 = 56,124.56 : x
2. Step 2: Convert to fraction form
   100,826/139,139.88 = 56,124.56/x
3. Step 3: Cross multiply
   100,826x = 139,139.88 × 56,124.56
4. Step 4: Simplify right side
   100,826x = 7,809,164,543.45
5. Step 5: Solve for x
   x = 7,809,164,543.45/100,826
6. Step 6: Final answer
   x = 77,451.89