Finding the Fourth Proportional to 1,571.50, 2,168.74 and 872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.50 : 2,168.74 = 872.88 : x
2. Step 2: Convert to fraction form
   1,571.50/2,168.74 = 872.88/x
3. Step 3: Cross multiply
   1,571.50x = 2,168.74 × 872.88
4. Step 4: Simplify right side
   1,571.50x = 1,893,049.77
5. Step 5: Solve for x
   x = 1,893,049.77/1,571.50
6. Step 6: Final answer
   x = 1,204.61