Finding the Fourth Proportional to 2,868.10, 4,302.06 and 920.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.10 : 4,302.06 = 920.28 : x
2. Step 2: Convert to fraction form
   2,868.10/4,302.06 = 920.28/x
3. Step 3: Cross multiply
   2,868.10x = 4,302.06 × 920.28
4. Step 4: Simplify right side
   2,868.10x = 3,959,099.78
5. Step 5: Solve for x
   x = 3,959,099.78/2,868.10
6. Step 6: Final answer
   x = 1,380.39