Finding the Fourth Proportional to 3,984.78, 5,499.11 and 2,216.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.78 : 5,499.11 = 2,216.51 : x
2. Step 2: Convert to fraction form
   3,984.78/5,499.11 = 2,216.51/x
3. Step 3: Cross multiply
   3,984.78x = 5,499.11 × 2,216.51
4. Step 4: Simplify right side
   3,984.78x = 12,188,793.73
5. Step 5: Solve for x
   x = 12,188,793.73/3,984.78
6. Step 6: Final answer
   x = 3,058.84