Finding the Fourth Proportional to 3,986.42, 5,500.71 and 2,217.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.42 : 5,500.71 = 2,217.78 : x
2. Step 2: Convert to fraction form
   3,986.42/5,500.71 = 2,217.78/x
3. Step 3: Cross multiply
   3,986.42x = 5,500.71 × 2,217.78
4. Step 4: Simplify right side
   3,986.42x = 12,199,364.62
5. Step 5: Solve for x
   x = 12,199,364.62/3,986.42
6. Step 6: Final answer
   x = 3,060.23