Finding the Fourth Proportional to 3,947.72, 5,447.61 and 2,179.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.72 : 5,447.61 = 2,179.33 : x
2. Step 2: Convert to fraction form
   3,947.72/5,447.61 = 2,179.33/x
3. Step 3: Cross multiply
   3,947.72x = 5,447.61 × 2,179.33
4. Step 4: Simplify right side
   3,947.72x = 11,872,126.28
5. Step 5: Solve for x
   x = 11,872,126.28/3,947.72
6. Step 6: Final answer
   x = 3,007.34