Finding the Fourth Proportional to 3,949.10, 5,449.78 and 2,180.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,949.10 : 5,449.78 = 2,180.72 : x
2. Step 2: Convert to fraction form
   3,949.10/5,449.78 = 2,180.72/x
3. Step 3: Cross multiply
   3,949.10x = 5,449.78 × 2,180.72
4. Step 4: Simplify right side
   3,949.10x = 11,884,444.24
5. Step 5: Solve for x
   x = 11,884,444.24/3,949.10
6. Step 6: Final answer
   x = 3,009.41