Finding the Fourth Proportional to 1,351.55, 1,866.27 and 855.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.55 : 1,866.27 = 855.06 : x
2. Step 2: Convert to fraction form
   1,351.55/1,866.27 = 855.06/x
3. Step 3: Cross multiply
   1,351.55x = 1,866.27 × 855.06
4. Step 4: Simplify right side
   1,351.55x = 1,595,772.83
5. Step 5: Solve for x
   x = 1,595,772.83/1,351.55
6. Step 6: Final answer
   x = 1,180.70