Finding the Fourth Proportional to 14,108.72, 19,470.12 and 7,821.20

Step by Step Solution

1. Step 1: Write the proportion equation
   14,108.72 : 19,470.12 = 7,821.20 : x
2. Step 2: Convert to fraction form
   14,108.72/19,470.12 = 7,821.20/x
3. Step 3: Cross multiply
   14,108.72x = 19,470.12 × 7,821.20
4. Step 4: Simplify right side
   14,108.72x = 152,279,702.54
5. Step 5: Solve for x
   x = 152,279,702.54/14,108.72
6. Step 6: Final answer
   x = 10,793.30