Finding the Fourth Proportional to 257,562.52, 386,341.89 and 80,069.20

Step by Step Solution

1. Step 1: Write the proportion equation
   257,562.52 : 386,341.89 = 80,069.20 : x
2. Step 2: Convert to fraction form
   257,562.52/386,341.89 = 80,069.20/x
3. Step 3: Cross multiply
   257,562.52x = 386,341.89 × 80,069.20
4. Step 4: Simplify right side
   257,562.52x = 30,934,086,058.79
5. Step 5: Solve for x
   x = 30,934,086,058.79/257,562.52
6. Step 6: Final answer
   x = 120,103.21