Finding the Fourth Proportional to 3,984.30, 5,498.31 and 2,215.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.30 : 5,498.31 = 2,215.89 : x
2. Step 2: Convert to fraction form
   3,984.30/5,498.31 = 2,215.89/x
3. Step 3: Cross multiply
   3,984.30x = 5,498.31 × 2,215.89
4. Step 4: Simplify right side
   3,984.30x = 12,183,650.15
5. Step 5: Solve for x
   x = 12,183,650.15/3,984.30
6. Step 6: Final answer
   x = 3,057.91