Finding the Fourth Proportional to 8,854.56, 12,216.78 and 5,712.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,854.56 : 12,216.78 = 5,712.57 : x
2. Step 2: Convert to fraction form
   8,854.56/12,216.78 = 5,712.57/x
3. Step 3: Cross multiply
   8,854.56x = 12,216.78 × 5,712.57
4. Step 4: Simplify right side
   8,854.56x = 69,789,210.92
5. Step 5: Solve for x
   x = 69,789,210.92/8,854.56
6. Step 6: Final answer
   x = 7,881.73