Finding the Fourth Proportional to 2,098.78, 3,143.85 and 1,231

Step by Step Solution

1. Step 1: Write the proportion equation
   2,098.78 : 3,143.85 = 1,231 : x
2. Step 2: Convert to fraction form
   2,098.78/3,143.85 = 1,231/x
3. Step 3: Cross multiply
   2,098.78x = 3,143.85 × 1,231
4. Step 4: Simplify right side
   2,098.78x = 3,870,079.35
5. Step 5: Solve for x
   x = 3,870,079.35/2,098.78
6. Step 6: Final answer
   x = 1,843.97