Finding the Fourth Proportional to 3,984.18, 5,498.16 and 2,215.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.18 : 5,498.16 = 2,215.79 : x
2. Step 2: Convert to fraction form
   3,984.18/5,498.16 = 2,215.79/x
3. Step 3: Cross multiply
   3,984.18x = 5,498.16 × 2,215.79
4. Step 4: Simplify right side
   3,984.18x = 12,182,740.46
5. Step 5: Solve for x
   x = 12,182,740.46/3,984.18
6. Step 6: Final answer
   x = 3,057.78