Finding the Fourth Proportional to 1,571.37, 2,168.54 and 872.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.37 : 2,168.54 = 872.74 : x
2. Step 2: Convert to fraction form
   1,571.37/2,168.54 = 872.74/x
3. Step 3: Cross multiply
   1,571.37x = 2,168.54 × 872.74
4. Step 4: Simplify right side
   1,571.37x = 1,892,571.60
5. Step 5: Solve for x
   x = 1,892,571.60/1,571.37
6. Step 6: Final answer
   x = 1,204.41