Finding the Fourth Proportional to 3,984.39, 5,498.37 and 2,215.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.39 : 5,498.37 = 2,215.88 : x
2. Step 2: Convert to fraction form
   3,984.39/5,498.37 = 2,215.88/x
3. Step 3: Cross multiply
   3,984.39x = 5,498.37 × 2,215.88
4. Step 4: Simplify right side
   3,984.39x = 12,183,719.91
5. Step 5: Solve for x
   x = 12,183,719.91/3,984.39
6. Step 6: Final answer
   x = 3,057.87