Finding the Fourth Proportional to 9,287.28, 12,816.42 and 5,561.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,287.28 : 12,816.42 = 5,561.28 : x
2. Step 2: Convert to fraction form
   9,287.28/12,816.42 = 5,561.28/x
3. Step 3: Cross multiply
   9,287.28x = 12,816.42 × 5,561.28
4. Step 4: Simplify right side
   9,287.28x = 71,275,700.22
5. Step 5: Solve for x
   x = 71,275,700.22/9,287.28
6. Step 6: Final answer
   x = 7,674.55