Finding the Fourth Proportional to 3,947.78, 5,447.98 and 2,179.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.78 : 5,447.98 = 2,179.34 : x
2. Step 2: Convert to fraction form
   3,947.78/5,447.98 = 2,179.34/x
3. Step 3: Cross multiply
   3,947.78x = 5,447.98 × 2,179.34
4. Step 4: Simplify right side
   3,947.78x = 11,873,000.73
5. Step 5: Solve for x
   x = 11,873,000.73/3,947.78
6. Step 6: Final answer
   x = 3,007.51