Finding the Fourth Proportional to 8,859.20, 12,225.78 and 5,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,859.20 : 12,225.78 = 5,321.72 : x
2. Step 2: Convert to fraction form
   8,859.20/12,225.78 = 5,321.72/x
3. Step 3: Cross multiply
   8,859.20x = 12,225.78 × 5,321.72
4. Step 4: Simplify right side
   8,859.20x = 65,062,116.81
5. Step 5: Solve for x
   x = 65,062,116.81/8,859.20
6. Step 6: Final answer
   x = 7,344.02