Finding the Fourth Proportional to 9,856.20, 14,789.16 and 4,308.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,856.20 : 14,789.16 = 4,308.72 : x
2. Step 2: Convert to fraction form
   9,856.20/14,789.16 = 4,308.72/x
3. Step 3: Cross multiply
   9,856.20x = 14,789.16 × 4,308.72
4. Step 4: Simplify right side
   9,856.20x = 63,722,349.48
5. Step 5: Solve for x
   x = 63,722,349.48/9,856.20
6. Step 6: Final answer
   x = 6,465.20