Finding the Fourth Proportional to 2,515.17, 3,771.39 and 871.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.17 : 3,771.39 = 871.59 : x
2. Step 2: Convert to fraction form
   2,515.17/3,771.39 = 871.59/x
3. Step 3: Cross multiply
   2,515.17x = 3,771.39 × 871.59
4. Step 4: Simplify right side
   2,515.17x = 3,287,105.81
5. Step 5: Solve for x
   x = 3,287,105.81/2,515.17
6. Step 6: Final answer
   x = 1,306.91