Finding the Fourth Proportional to 2,104.93, 3,155.61 and 871.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.93 : 3,155.61 = 871.57 : x
2. Step 2: Convert to fraction form
   2,104.93/3,155.61 = 871.57/x
3. Step 3: Cross multiply
   2,104.93x = 3,155.61 × 871.57
4. Step 4: Simplify right side
   2,104.93x = 2,750,335.01
5. Step 5: Solve for x
   x = 2,750,335.01/2,104.93
6. Step 6: Final answer
   x = 1,306.62