Finding the Fourth Proportional to 3,923.56, 5,414.50 and 2,155.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.56 : 5,414.50 = 2,155.18 : x
2. Step 2: Convert to fraction form
   3,923.56/5,414.50 = 2,155.18/x
3. Step 3: Cross multiply
   3,923.56x = 5,414.50 × 2,155.18
4. Step 4: Simplify right side
   3,923.56x = 11,669,222.11
5. Step 5: Solve for x
   x = 11,669,222.11/3,923.56
6. Step 6: Final answer
   x = 2,974.14