Finding the Fourth Proportional to 1,571.29, 2,168.49 and 872.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.29 : 2,168.49 = 872.71 : x
2. Step 2: Convert to fraction form
   1,571.29/2,168.49 = 872.71/x
3. Step 3: Cross multiply
   1,571.29x = 2,168.49 × 872.71
4. Step 4: Simplify right side
   1,571.29x = 1,892,462.91
5. Step 5: Solve for x
   x = 1,892,462.91/1,571.29
6. Step 6: Final answer
   x = 1,204.40