Finding the Fourth Proportional to 3,993.84, 5,986.98 and 2,142.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,993.84 : 5,986.98 = 2,142.18 : x
2. Step 2: Convert to fraction form
   3,993.84/5,986.98 = 2,142.18/x
3. Step 3: Cross multiply
   3,993.84x = 5,986.98 × 2,142.18
4. Step 4: Simplify right side
   3,993.84x = 12,825,188.82
5. Step 5: Solve for x
   x = 12,825,188.82/3,993.84
6. Step 6: Final answer
   x = 3,211.24