Finding the Fourth Proportional to 2,868.38, 4,302.55 and 920.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.38 : 4,302.55 = 920.59 : x
2. Step 2: Convert to fraction form
   2,868.38/4,302.55 = 920.59/x
3. Step 3: Cross multiply
   2,868.38x = 4,302.55 × 920.59
4. Step 4: Simplify right side
   2,868.38x = 3,960,874.90
5. Step 5: Solve for x
   x = 3,960,874.90/2,868.38
6. Step 6: Final answer
   x = 1,380.87