Finding the Fourth Proportional to 2,868.27, 4,302.18 and 920.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.27 : 4,302.18 = 920.40 : x
2. Step 2: Convert to fraction form
   2,868.27/4,302.18 = 920.40/x
3. Step 3: Cross multiply
   2,868.27x = 4,302.18 × 920.40
4. Step 4: Simplify right side
   2,868.27x = 3,959,726.47
5. Step 5: Solve for x
   x = 3,959,726.47/2,868.27
6. Step 6: Final answer
   x = 1,380.53