Finding the Fourth Proportional to 9,571.88, 13,209.20 and 5,380.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,571.88 : 13,209.20 = 5,380.16 : x
2. Step 2: Convert to fraction form
   9,571.88/13,209.20 = 5,380.16/x
3. Step 3: Cross multiply
   9,571.88x = 13,209.20 × 5,380.16
4. Step 4: Simplify right side
   9,571.88x = 71,067,609.47
5. Step 5: Solve for x
   x = 71,067,609.47/9,571.88
6. Step 6: Final answer
   x = 7,424.62