Finding the Fourth Proportional to 8,456.87, 12,685.01 and 2,216.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.87 : 12,685.01 = 2,216.82 : x
2. Step 2: Convert to fraction form
   8,456.87/12,685.01 = 2,216.82/x
3. Step 3: Cross multiply
   8,456.87x = 12,685.01 × 2,216.82
4. Step 4: Simplify right side
   8,456.87x = 28,120,372.78
5. Step 5: Solve for x
   x = 28,120,372.78/8,456.87
6. Step 6: Final answer
   x = 3,325.15