Finding the Fourth Proportional to 2,089.91, 3,132.59 and 855.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.91 : 3,132.59 = 855.86 : x
2. Step 2: Convert to fraction form
   2,089.91/3,132.59 = 855.86/x
3. Step 3: Cross multiply
   2,089.91x = 3,132.59 × 855.86
4. Step 4: Simplify right side
   2,089.91x = 2,681,038.54
5. Step 5: Solve for x
   x = 2,681,038.54/2,089.91
6. Step 6: Final answer
   x = 1,282.85