Finding the Fourth Proportional to 103,874.56, 155,811.92 and 80,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   103,874.56 : 155,811.92 = 80,216.72 : x
2. Step 2: Convert to fraction form
   103,874.56/155,811.92 = 80,216.72/x
3. Step 3: Cross multiply
   103,874.56x = 155,811.92 × 80,216.72
4. Step 4: Simplify right side
   103,874.56x = 12,498,721,159.30
5. Step 5: Solve for x
   x = 12,498,721,159.30/103,874.56
6. Step 6: Final answer
   x = 120,325.14