Finding the Fourth Proportional to 3,985.56, 5,500.40 and 2,217.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.56 : 5,500.40 = 2,217.50 : x
2. Step 2: Convert to fraction form
   3,985.56/5,500.40 = 2,217.50/x
3. Step 3: Cross multiply
   3,985.56x = 5,500.40 × 2,217.50
4. Step 4: Simplify right side
   3,985.56x = 12,197,098.41
5. Step 5: Solve for x
   x = 12,197,098.41/3,985.56
6. Step 6: Final answer
   x = 3,060.32