Finding the Fourth Proportional to 3,923.76, 5,414.72 and 2,155.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.76 : 5,414.72 = 2,155.52 : x
2. Step 2: Convert to fraction form
   3,923.76/5,414.72 = 2,155.52/x
3. Step 3: Cross multiply
   3,923.76x = 5,414.72 × 2,155.52
4. Step 4: Simplify right side
   3,923.76x = 11,671,537.25
5. Step 5: Solve for x
   x = 11,671,537.25/3,923.76
6. Step 6: Final answer
   x = 2,974.58