Finding the Fourth Proportional to 10,385.20, 14,331.48 and 6,404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,385.20 : 14,331.48 = 6,404.72 : x
2. Step 2: Convert to fraction form
   10,385.20/14,331.48 = 6,404.72/x
3. Step 3: Cross multiply
   10,385.20x = 14,331.48 × 6,404.72
4. Step 4: Simplify right side
   10,385.20x = 91,789,116.59
5. Step 5: Solve for x
   x = 91,789,116.59/10,385.20
6. Step 6: Final answer
   x = 8,838.45