Finding the Fourth Proportional to 100,842.12, 139,162.14 and 55,520.28

Step by Step Solution

1. Step 1: Write the proportion equation
   100,842.12 : 139,162.14 = 55,520.28 : x
2. Step 2: Convert to fraction form
   100,842.12/139,162.14 = 55,520.28/x
3. Step 3: Cross multiply
   100,842.12x = 139,162.14 × 55,520.28
4. Step 4: Simplify right side
   100,842.12x = 7,726,320,978.20
5. Step 5: Solve for x
   x = 7,726,320,978.20/100,842.12
6. Step 6: Final answer
   x = 76,617.99