Finding the Fourth Proportional to 3,947.89, 5,447.94 and 2,179.48

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.89 : 5,447.94 = 2,179.48 : x
2. Step 2: Convert to fraction form
   3,947.89/5,447.94 = 2,179.48/x
3. Step 3: Cross multiply
   3,947.89x = 5,447.94 × 2,179.48
4. Step 4: Simplify right side
   3,947.89x = 11,873,676.27
5. Step 5: Solve for x
   x = 11,873,676.27/3,947.89
6. Step 6: Final answer
   x = 3,007.60