Finding the Fourth Proportional to 3,986.18, 5,500.95 and 2,217.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.18 : 5,500.95 = 2,217.89 : x
2. Step 2: Convert to fraction form
   3,986.18/5,500.95 = 2,217.89/x
3. Step 3: Cross multiply
   3,986.18x = 5,500.95 × 2,217.89
4. Step 4: Simplify right side
   3,986.18x = 12,200,507.43
5. Step 5: Solve for x
   x = 12,200,507.43/3,986.18
6. Step 6: Final answer
   x = 3,060.70