Finding the Fourth Proportional to 1,353.25, 1,866.77 and 855.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,353.25 : 1,866.77 = 855.71 : x
2. Step 2: Convert to fraction form
   1,353.25/1,866.77 = 855.71/x
3. Step 3: Cross multiply
   1,353.25x = 1,866.77 × 855.71
4. Step 4: Simplify right side
   1,353.25x = 1,597,413.76
5. Step 5: Solve for x
   x = 1,597,413.76/1,353.25
6. Step 6: Final answer
   x = 1,180.43