Finding the Fourth Proportional to 1,571.24, 2,168.16 and 872.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.24 : 2,168.16 = 872.57 : x
2. Step 2: Convert to fraction form
   1,571.24/2,168.16 = 872.57/x
3. Step 3: Cross multiply
   1,571.24x = 2,168.16 × 872.57
4. Step 4: Simplify right side
   1,571.24x = 1,891,871.37
5. Step 5: Solve for x
   x = 1,891,871.37/1,571.24
6. Step 6: Final answer
   x = 1,204.06