Finding the Fourth Proportional to 9,772.48, 13,485.28 and 5,580.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,772.48 : 13,485.28 = 5,580.16 : x
2. Step 2: Convert to fraction form
   9,772.48/13,485.28 = 5,580.16/x
3. Step 3: Cross multiply
   9,772.48x = 13,485.28 × 5,580.16
4. Step 4: Simplify right side
   9,772.48x = 75,250,020.04
5. Step 5: Solve for x
   x = 75,250,020.04/9,772.48
6. Step 6: Final answer
   x = 7,700.20