Finding the Fourth Proportional to 2,610.22, 3,915.78 and 855.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.22 : 3,915.78 = 855.64 : x
2. Step 2: Convert to fraction form
   2,610.22/3,915.78 = 855.64/x
3. Step 3: Cross multiply
   2,610.22x = 3,915.78 × 855.64
4. Step 4: Simplify right side
   2,610.22x = 3,350,498.00
5. Step 5: Solve for x
   x = 3,350,498.00/2,610.22
6. Step 6: Final answer
   x = 1,283.61