Finding the Fourth Proportional to 3,986.96, 5,501.96 and 2,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.96 : 5,501.96 = 2,218.72 : x
2. Step 2: Convert to fraction form
   3,986.96/5,501.96 = 2,218.72/x
3. Step 3: Cross multiply
   3,986.96x = 5,501.96 × 2,218.72
4. Step 4: Simplify right side
   3,986.96x = 12,207,308.69
5. Step 5: Solve for x
   x = 12,207,308.69/3,986.96
6. Step 6: Final answer
   x = 3,061.81