Finding the Fourth Proportional to 2,089.42, 3,131.37 and 855.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.42 : 3,131.37 = 855.42 : x
2. Step 2: Convert to fraction form
   2,089.42/3,131.37 = 855.42/x
3. Step 3: Cross multiply
   2,089.42x = 3,131.37 × 855.42
4. Step 4: Simplify right side
   2,089.42x = 2,678,636.53
5. Step 5: Solve for x
   x = 2,678,636.53/2,089.42
6. Step 6: Final answer
   x = 1,282.00