Finding the Fourth Proportional to 3,986.53, 5,501.16 and 2,218.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.53 : 5,501.16 = 2,218.09 : x
2. Step 2: Convert to fraction form
   3,986.53/5,501.16 = 2,218.09/x
3. Step 3: Cross multiply
   3,986.53x = 5,501.16 × 2,218.09
4. Step 4: Simplify right side
   3,986.53x = 12,202,067.98
5. Step 5: Solve for x
   x = 12,202,067.98/3,986.53
6. Step 6: Final answer
   x = 3,060.82