Finding the Fourth Proportional to 2,864.78, 4,297.83 and 890.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,864.78 : 4,297.83 = 890.30 : x
2. Step 2: Convert to fraction form
   2,864.78/4,297.83 = 890.30/x
3. Step 3: Cross multiply
   2,864.78x = 4,297.83 × 890.30
4. Step 4: Simplify right side
   2,864.78x = 3,826,358.05
5. Step 5: Solve for x
   x = 3,826,358.05/2,864.78
6. Step 6: Final answer
   x = 1,335.66