Finding the Fourth Proportional to 2,610.55, 3,916.43 and 855.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.55 : 3,916.43 = 855.55 : x
2. Step 2: Convert to fraction form
   2,610.55/3,916.43 = 855.55/x
3. Step 3: Cross multiply
   2,610.55x = 3,916.43 × 855.55
4. Step 4: Simplify right side
   2,610.55x = 3,350,701.69
5. Step 5: Solve for x
   x = 3,350,701.69/2,610.55
6. Step 6: Final answer
   x = 1,283.52