Finding the Fourth Proportional to 3,986.58, 5,501.57 and 2,218.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.58 : 5,501.57 = 2,218.30 : x
2. Step 2: Convert to fraction form
   3,986.58/5,501.57 = 2,218.30/x
3. Step 3: Cross multiply
   3,986.58x = 5,501.57 × 2,218.30
4. Step 4: Simplify right side
   3,986.58x = 12,204,151.31
5. Step 5: Solve for x
   x = 12,204,151.31/3,986.58
6. Step 6: Final answer
   x = 3,061.31