Finding the Fourth Proportional to 2,854.50, 4,281.78 and 906.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,854.50 : 4,281.78 = 906.78 : x
2. Step 2: Convert to fraction form
   2,854.50/4,281.78 = 906.78/x
3. Step 3: Cross multiply
   2,854.50x = 4,281.78 × 906.78
4. Step 4: Simplify right side
   2,854.50x = 3,882,632.47
5. Step 5: Solve for x
   x = 3,882,632.47/2,854.50
6. Step 6: Final answer
   x = 1,360.18