Finding the Fourth Proportional to 2,610.45, 3,915.23 and 855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.45 : 3,915.23 = 855.50 : x
2. Step 2: Convert to fraction form
   2,610.45/3,915.23 = 855.50/x
3. Step 3: Cross multiply
   2,610.45x = 3,915.23 × 855.50
4. Step 4: Simplify right side
   2,610.45x = 3,349,455.41
5. Step 5: Solve for x
   x = 3,349,455.41/2,610.45
6. Step 6: Final answer
   x = 1,283.10