Finding the Fourth Proportional to 8,857.36, 12,222.84 and 5,716.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,857.36 : 12,222.84 = 5,716.72 : x
2. Step 2: Convert to fraction form
   8,857.36/12,222.84 = 5,716.72/x
3. Step 3: Cross multiply
   8,857.36x = 12,222.84 × 5,716.72
4. Step 4: Simplify right side
   8,857.36x = 69,874,553.88
5. Step 5: Solve for x
   x = 69,874,553.88/8,857.36
6. Step 6: Final answer
   x = 7,888.87