Finding the Fourth Proportional to 2,128.78, 3,191.85 and 895.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.78 : 3,191.85 = 895.55 : x
2. Step 2: Convert to fraction form
   2,128.78/3,191.85 = 895.55/x
3. Step 3: Cross multiply
   2,128.78x = 3,191.85 × 895.55
4. Step 4: Simplify right side
   2,128.78x = 2,858,456.79
5. Step 5: Solve for x
   x = 2,858,456.79/2,128.78
6. Step 6: Final answer
   x = 1,342.77