Finding the Fourth Proportional to 3,986.15, 5,500.86 and 2,217.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.15 : 5,500.86 = 2,217.75 : x
2. Step 2: Convert to fraction form
   3,986.15/5,500.86 = 2,217.75/x
3. Step 3: Cross multiply
   3,986.15x = 5,500.86 × 2,217.75
4. Step 4: Simplify right side
   3,986.15x = 12,199,532.27
5. Step 5: Solve for x
   x = 12,199,532.27/3,986.15
6. Step 6: Final answer
   x = 3,060.48