Finding the Fourth Proportional to 2,152.78, 3,229.67 and 919.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.78 : 3,229.67 = 919.55 : x
2. Step 2: Convert to fraction form
   2,152.78/3,229.67 = 919.55/x
3. Step 3: Cross multiply
   2,152.78x = 3,229.67 × 919.55
4. Step 4: Simplify right side
   2,152.78x = 2,969,853.42
5. Step 5: Solve for x
   x = 2,969,853.42/2,152.78
6. Step 6: Final answer
   x = 1,379.54