Finding the Fourth Proportional to 2,103.17, 3,155.40 and 871.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.17 : 3,155.40 = 871.16 : x
2. Step 2: Convert to fraction form
   2,103.17/3,155.40 = 871.16/x
3. Step 3: Cross multiply
   2,103.17x = 3,155.40 × 871.16
4. Step 4: Simplify right side
   2,103.17x = 2,748,842.49
5. Step 5: Solve for x
   x = 2,748,842.49/2,103.17
6. Step 6: Final answer
   x = 1,307.00