Finding the Fourth Proportional to 14,280.46, 19,714.18 and 8,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   14,280.46 : 19,714.18 = 8,978.20 : x
2. Step 2: Convert to fraction form
   14,280.46/19,714.18 = 8,978.20/x
3. Step 3: Cross multiply
   14,280.46x = 19,714.18 × 8,978.20
4. Step 4: Simplify right side
   14,280.46x = 176,997,729.86
5. Step 5: Solve for x
   x = 176,997,729.86/14,280.46
6. Step 6: Final answer
   x = 12,394.40