Finding the Fourth Proportional to 1,571.27, 2,168.30 and 863.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.27 : 2,168.30 = 863.12 : x
2. Step 2: Convert to fraction form
   1,571.27/2,168.30 = 863.12/x
3. Step 3: Cross multiply
   1,571.27x = 2,168.30 × 863.12
4. Step 4: Simplify right side
   1,571.27x = 1,871,510.67
5. Step 5: Solve for x
   x = 1,871,510.67/1,571.27
6. Step 6: Final answer
   x = 1,191.09