Finding the Fourth Proportional to 1,571.30, 2,168.39 and 872.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.30 : 2,168.39 = 872.67 : x
2. Step 2: Convert to fraction form
   1,571.30/2,168.39 = 872.67/x
3. Step 3: Cross multiply
   1,571.30x = 2,168.39 × 872.67
4. Step 4: Simplify right side
   1,571.30x = 1,892,295.94
5. Step 5: Solve for x
   x = 1,892,295.94/1,571.30
6. Step 6: Final answer
   x = 1,204.29