Finding the Fourth Proportional to 2,830.89, 4,245.06 and 855.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,830.89 : 4,245.06 = 855.75 : x
2. Step 2: Convert to fraction form
   2,830.89/4,245.06 = 855.75/x
3. Step 3: Cross multiply
   2,830.89x = 4,245.06 × 855.75
4. Step 4: Simplify right side
   2,830.89x = 3,632,724.41
5. Step 5: Solve for x
   x = 3,632,724.41/2,830.89
6. Step 6: Final answer
   x = 1,283.25