Finding the Fourth Proportional to 8,859.36, 12,225.60 and 5,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,859.36 : 12,225.60 = 5,718.72 : x
2. Step 2: Convert to fraction form
   8,859.36/12,225.60 = 5,718.72/x
3. Step 3: Cross multiply
   8,859.36x = 12,225.60 × 5,718.72
4. Step 4: Simplify right side
   8,859.36x = 69,914,783.23
5. Step 5: Solve for x
   x = 69,914,783.23/8,859.36
6. Step 6: Final answer
   x = 7,891.63