Finding the Fourth Proportional to 8,729.21, 12,015.89 and 7,608.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,729.21 : 12,015.89 = 7,608.20 : x
2. Step 2: Convert to fraction form
   8,729.21/12,015.89 = 7,608.20/x
3. Step 3: Cross multiply
   8,729.21x = 12,015.89 × 7,608.20
4. Step 4: Simplify right side
   8,729.21x = 91,419,304.69
5. Step 5: Solve for x
   x = 91,419,304.69/8,729.21
6. Step 6: Final answer
   x = 10,472.80