Finding the Fourth Proportional to 2,087.84, 3,131.22 and 855.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.84 : 3,131.22 = 855.02 : x
2. Step 2: Convert to fraction form
   2,087.84/3,131.22 = 855.02/x
3. Step 3: Cross multiply
   2,087.84x = 3,131.22 × 855.02
4. Step 4: Simplify right side
   2,087.84x = 2,677,255.72
5. Step 5: Solve for x
   x = 2,677,255.72/2,087.84
6. Step 6: Final answer
   x = 1,282.31