Finding the Fourth Proportional to 2,431.92, 3,648.65 and 871.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,431.92 : 3,648.65 = 871.89 : x
2. Step 2: Convert to fraction form
   2,431.92/3,648.65 = 871.89/x
3. Step 3: Cross multiply
   2,431.92x = 3,648.65 × 871.89
4. Step 4: Simplify right side
   2,431.92x = 3,181,217.09
5. Step 5: Solve for x
   x = 3,181,217.09/2,431.92
6. Step 6: Final answer
   x = 1,308.11