Finding the Fourth Proportional to 3,923.45, 5,414.72 and 2,155.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.45 : 5,414.72 = 2,155.33 : x
2. Step 2: Convert to fraction form
   3,923.45/5,414.72 = 2,155.33/x
3. Step 3: Cross multiply
   3,923.45x = 5,414.72 × 2,155.33
4. Step 4: Simplify right side
   3,923.45x = 11,670,508.46
5. Step 5: Solve for x
   x = 11,670,508.46/3,923.45
6. Step 6: Final answer
   x = 2,974.55