Finding the Fourth Proportional to 9,648.81, 13,315.88 and 5,399.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,648.81 : 13,315.88 = 5,399.61 : x
2. Step 2: Convert to fraction form
   9,648.81/13,315.88 = 5,399.61/x
3. Step 3: Cross multiply
   9,648.81x = 13,315.88 × 5,399.61
4. Step 4: Simplify right side
   9,648.81x = 71,900,558.81
5. Step 5: Solve for x
   x = 71,900,558.81/9,648.81
6. Step 6: Final answer
   x = 7,451.75