Finding the Fourth Proportional to 1,571.34, 2,168.37 and 872.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.34 : 2,168.37 = 872.70 : x
2. Step 2: Convert to fraction form
   1,571.34/2,168.37 = 872.70/x
3. Step 3: Cross multiply
   1,571.34x = 2,168.37 × 872.70
4. Step 4: Simplify right side
   1,571.34x = 1,892,336.50
5. Step 5: Solve for x
   x = 1,892,336.50/1,571.34
6. Step 6: Final answer
   x = 1,204.28