Finding the Fourth Proportional to 9,025.40, 12,456.48 and 5,489.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,025.40 : 12,456.48 = 5,489.72 : x
2. Step 2: Convert to fraction form
   9,025.40/12,456.48 = 5,489.72/x
3. Step 3: Cross multiply
   9,025.40x = 12,456.48 × 5,489.72
4. Step 4: Simplify right side
   9,025.40x = 68,382,587.39
5. Step 5: Solve for x
   x = 68,382,587.39/9,025.40
6. Step 6: Final answer
   x = 7,576.68