Finding the Fourth Proportional to 3,986.51, 5,501.39 and 2,218.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,986.51 : 5,501.39 = 2,218.12 : x
2. Step 2: Convert to fraction form
   3,986.51/5,501.39 = 2,218.12/x
3. Step 3: Cross multiply
   3,986.51x = 5,501.39 × 2,218.12
4. Step 4: Simplify right side
   3,986.51x = 12,202,704.59
5. Step 5: Solve for x
   x = 12,202,704.59/3,986.51
6. Step 6: Final answer
   x = 3,061.00