Finding the Fourth Proportional to 2,103.20, 3,153.45 and 871.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.20 : 3,153.45 = 871.10 : x
2. Step 2: Convert to fraction form
   2,103.20/3,153.45 = 871.10/x
3. Step 3: Cross multiply
   2,103.20x = 3,153.45 × 871.10
4. Step 4: Simplify right side
   2,103.20x = 2,746,970.30
5. Step 5: Solve for x
   x = 2,746,970.30/2,103.20
6. Step 6: Final answer
   x = 1,306.09