Finding the Fourth Proportional to 280,385.86, 386,930.46 and 153,061.42

Step by Step Solution

1. Step 1: Write the proportion equation
   280,385.86 : 386,930.46 = 153,061.42 : x
2. Step 2: Convert to fraction form
   280,385.86/386,930.46 = 153,061.42/x
3. Step 3: Cross multiply
   280,385.86x = 386,930.46 × 153,061.42
4. Step 4: Simplify right side
   280,385.86x = 59,224,125,648.85
5. Step 5: Solve for x
   x = 59,224,125,648.85/280,385.86
6. Step 6: Final answer
   x = 211,223.65