Finding the Fourth Proportional to 3,985.76, 5,500.50 and 2,217.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.76 : 5,500.50 = 2,217.80 : x
2. Step 2: Convert to fraction form
   3,985.76/5,500.50 = 2,217.80/x
3. Step 3: Cross multiply
   3,985.76x = 5,500.50 × 2,217.80
4. Step 4: Simplify right side
   3,985.76x = 12,199,008.90
5. Step 5: Solve for x
   x = 12,199,008.90/3,985.76
6. Step 6: Final answer
   x = 3,060.65