Finding the Fourth Proportional to 3,949.18, 5,449.89 and 2,180.79

Step by Step Solution

1. Step 1: Write the proportion equation
   3,949.18 : 5,449.89 = 2,180.79 : x
2. Step 2: Convert to fraction form
   3,949.18/5,449.89 = 2,180.79/x
3. Step 3: Cross multiply
   3,949.18x = 5,449.89 × 2,180.79
4. Step 4: Simplify right side
   3,949.18x = 11,885,065.61
5. Step 5: Solve for x
   x = 11,885,065.61/3,949.18
6. Step 6: Final answer
   x = 3,009.50