Finding the Fourth Proportional to 3,923.33, 5,414.31 and 2,155.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.33 : 5,414.31 = 2,155.05 : x
2. Step 2: Convert to fraction form
   3,923.33/5,414.31 = 2,155.05/x
3. Step 3: Cross multiply
   3,923.33x = 5,414.31 × 2,155.05
4. Step 4: Simplify right side
   3,923.33x = 11,668,100.68
5. Step 5: Solve for x
   x = 11,668,100.68/3,923.33
6. Step 6: Final answer
   x = 2,974.03