Finding the Fourth Proportional to 9,648.28, 13,314.88 and 5,399.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,648.28 : 13,314.88 = 5,399.20 : x
2. Step 2: Convert to fraction form
   9,648.28/13,314.88 = 5,399.20/x
3. Step 3: Cross multiply
   9,648.28x = 13,314.88 × 5,399.20
4. Step 4: Simplify right side
   9,648.28x = 71,889,700.10
5. Step 5: Solve for x
   x = 71,889,700.10/9,648.28
6. Step 6: Final answer
   x = 7,451.04