Finding the Fourth Proportional to 2,103.25, 3,155.77 and 871.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.25 : 3,155.77 = 871.56 : x
2. Step 2: Convert to fraction form
   2,103.25/3,155.77 = 871.56/x
3. Step 3: Cross multiply
   2,103.25x = 3,155.77 × 871.56
4. Step 4: Simplify right side
   2,103.25x = 2,750,442.90
5. Step 5: Solve for x
   x = 2,750,442.90/2,103.25
6. Step 6: Final answer
   x = 1,307.71