Finding the Fourth Proportional to 2,103.42, 3,156 and 871.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.42 : 3,156 = 871.08 : x
2. Step 2: Convert to fraction form
   2,103.42/3,156 = 871.08/x
3. Step 3: Cross multiply
   2,103.42x = 3,156 × 871.08
4. Step 4: Simplify right side
   2,103.42x = 2,749,128.48
5. Step 5: Solve for x
   x = 2,749,128.48/2,103.42
6. Step 6: Final answer
   x = 1,306.98