Finding the Fourth Proportional to 3,984.16, 5,498.10 and 2,215.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.16 : 5,498.10 = 2,215.86 : x
2. Step 2: Convert to fraction form
   3,984.16/5,498.10 = 2,215.86/x
3. Step 3: Cross multiply
   3,984.16x = 5,498.10 × 2,215.86
4. Step 4: Simplify right side
   3,984.16x = 12,183,019.87
5. Step 5: Solve for x
   x = 12,183,019.87/3,984.16
6. Step 6: Final answer
   x = 3,057.86