Finding the Fourth Proportional to 9,291.36, 12,816.72 and 5,563.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,291.36 : 12,816.72 = 5,563.20 : x
2. Step 2: Convert to fraction form
   9,291.36/12,816.72 = 5,563.20/x
3. Step 3: Cross multiply
   9,291.36x = 12,816.72 × 5,563.20
4. Step 4: Simplify right side
   9,291.36x = 71,301,976.70
5. Step 5: Solve for x
   x = 71,301,976.70/9,291.36
6. Step 6: Final answer
   x = 7,674.01