Finding the Fourth Proportional to 80,139.17, 120,171.84 and 45,078.83

Step by Step Solution

1. Step 1: Write the proportion equation
   80,139.17 : 120,171.84 = 45,078.83 : x
2. Step 2: Convert to fraction form
   80,139.17/120,171.84 = 45,078.83/x
3. Step 3: Cross multiply
   80,139.17x = 120,171.84 × 45,078.83
4. Step 4: Simplify right side
   80,139.17x = 5,417,205,626.89
5. Step 5: Solve for x
   x = 5,417,205,626.89/80,139.17
6. Step 6: Final answer
   x = 67,597.47