Finding the Fourth Proportional to 3,923.55, 5,414.61 and 2,155.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.55 : 5,414.61 = 2,155.27 : x
2. Step 2: Convert to fraction form
   3,923.55/5,414.61 = 2,155.27/x
3. Step 3: Cross multiply
   3,923.55x = 5,414.61 × 2,155.27
4. Step 4: Simplify right side
   3,923.55x = 11,669,946.49
5. Step 5: Solve for x
   x = 11,669,946.49/3,923.55
6. Step 6: Final answer
   x = 2,974.33