Finding the Fourth Proportional to 8,857.98, 12,219.93 and 5,715.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,857.98 : 12,219.93 = 5,715.18 : x
2. Step 2: Convert to fraction form
   8,857.98/12,219.93 = 5,715.18/x
3. Step 3: Cross multiply
   8,857.98x = 12,219.93 × 5,715.18
4. Step 4: Simplify right side
   8,857.98x = 69,839,099.54
5. Step 5: Solve for x
   x = 69,839,099.54/8,857.98
6. Step 6: Final answer
   x = 7,884.31