Finding the Fourth Proportional to 3,986.72, 5,501.67 and 2,218.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.72 : 5,501.67 = 2,218.44 : x
2. Step 2: Convert to fraction form
   3,986.72/5,501.67 = 2,218.44/x
3. Step 3: Cross multiply
   3,986.72x = 5,501.67 × 2,218.44
4. Step 4: Simplify right side
   3,986.72x = 12,205,118.64
5. Step 5: Solve for x
   x = 12,205,118.64/3,986.72
6. Step 6: Final answer
   x = 3,061.44