Finding the Fourth Proportional to 1,571.54, 2,168.71 and 872.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.54 : 2,168.71 = 872.91 : x
2. Step 2: Convert to fraction form
   1,571.54/2,168.71 = 872.91/x
3. Step 3: Cross multiply
   1,571.54x = 2,168.71 × 872.91
4. Step 4: Simplify right side
   1,571.54x = 1,893,086.46
5. Step 5: Solve for x
   x = 1,893,086.46/1,571.54
6. Step 6: Final answer
   x = 1,204.61