Finding the Fourth Proportional to 9,772.28, 13,480.20 and 5,792.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,772.28 : 13,480.20 = 5,792.72 : x
2. Step 2: Convert to fraction form
   9,772.28/13,480.20 = 5,792.72/x
3. Step 3: Cross multiply
   9,772.28x = 13,480.20 × 5,792.72
4. Step 4: Simplify right side
   9,772.28x = 78,087,024.14
5. Step 5: Solve for x
   x = 78,087,024.14/9,772.28
6. Step 6: Final answer
   x = 7,990.67