Finding the Fourth Proportional to 9,728.88, 13,425.62 and 5,421.94

Step by Step Solution

1. Step 1: Write the proportion equation
   9,728.88 : 13,425.62 = 5,421.94 : x
2. Step 2: Convert to fraction form
   9,728.88/13,425.62 = 5,421.94/x
3. Step 3: Cross multiply
   9,728.88x = 13,425.62 × 5,421.94
4. Step 4: Simplify right side
   9,728.88x = 72,792,906.10
5. Step 5: Solve for x
   x = 72,792,906.10/9,728.88
6. Step 6: Final answer
   x = 7,482.15