Finding the Fourth Proportional to 2,153.82, 3,231.21 and 855.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.82 : 3,231.21 = 855.27 : x
2. Step 2: Convert to fraction form
   2,153.82/3,231.21 = 855.27/x
3. Step 3: Cross multiply
   2,153.82x = 3,231.21 × 855.27
4. Step 4: Simplify right side
   2,153.82x = 2,763,556.98
5. Step 5: Solve for x
   x = 2,763,556.98/2,153.82
6. Step 6: Final answer
   x = 1,283.10