Finding the Fourth Proportional to 2,103.77, 3,153.99 and 871.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.77 : 3,153.99 = 871.76 : x
2. Step 2: Convert to fraction form
   2,103.77/3,153.99 = 871.76/x
3. Step 3: Cross multiply
   2,103.77x = 3,153.99 × 871.76
4. Step 4: Simplify right side
   2,103.77x = 2,749,522.32
5. Step 5: Solve for x
   x = 2,749,522.32/2,103.77
6. Step 6: Final answer
   x = 1,306.95