Finding the Fourth Proportional to 2,169.24, 3,255.72 and 871.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,169.24 : 3,255.72 = 871.64 : x
2. Step 2: Convert to fraction form
   2,169.24/3,255.72 = 871.64/x
3. Step 3: Cross multiply
   2,169.24x = 3,255.72 × 871.64
4. Step 4: Simplify right side
   2,169.24x = 2,837,815.78
5. Step 5: Solve for x
   x = 2,837,815.78/2,169.24
6. Step 6: Final answer
   x = 1,308.21