Finding the Fourth Proportional to 2,087.98, 3,133.38 and 855.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.98 : 3,133.38 = 855.61 : x
2. Step 2: Convert to fraction form
   2,087.98/3,133.38 = 855.61/x
3. Step 3: Cross multiply
   2,087.98x = 3,133.38 × 855.61
4. Step 4: Simplify right side
   2,087.98x = 2,680,964.26
5. Step 5: Solve for x
   x = 2,680,964.26/2,087.98
6. Step 6: Final answer
   x = 1,284.00