Finding the Fourth Proportional to 8,516.56, 12,854.84 and 8,516.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,516.56 : 12,854.84 = 8,516.56 : x
2. Step 2: Convert to fraction form
   8,516.56/12,854.84 = 8,516.56/x
3. Step 3: Cross multiply
   8,516.56x = 12,854.84 × 8,516.56
4. Step 4: Simplify right side
   8,516.56x = 109,479,016.15
5. Step 5: Solve for x
   x = 109,479,016.15/8,516.56
6. Step 6: Final answer
   x = 12,854.84