Finding the Fourth Proportional to 2,104.29, 3,156.30 and 871.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.29 : 3,156.30 = 871.25 : x
2. Step 2: Convert to fraction form
   2,104.29/3,156.30 = 871.25/x
3. Step 3: Cross multiply
   2,104.29x = 3,156.30 × 871.25
4. Step 4: Simplify right side
   2,104.29x = 2,749,910.59
5. Step 5: Solve for x
   x = 2,749,910.59/2,104.29
6. Step 6: Final answer
   x = 1,306.81