Finding the Fourth Proportional to 1,571.45, 2,168.67 and 872.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.45 : 2,168.67 = 872.81 : x
2. Step 2: Convert to fraction form
   1,571.45/2,168.67 = 872.81/x
3. Step 3: Cross multiply
   1,571.45x = 2,168.67 × 872.81
4. Step 4: Simplify right side
   1,571.45x = 1,892,836.86
5. Step 5: Solve for x
   x = 1,892,836.86/1,571.45
6. Step 6: Final answer
   x = 1,204.52