Finding the Fourth Proportional to 1,571.17, 2,168.18 and 872.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.17 : 2,168.18 = 872.50 : x
2. Step 2: Convert to fraction form
   1,571.17/2,168.18 = 872.50/x
3. Step 3: Cross multiply
   1,571.17x = 2,168.18 × 872.50
4. Step 4: Simplify right side
   1,571.17x = 1,891,732.69
5. Step 5: Solve for x
   x = 1,891,732.69/1,571.17
6. Step 6: Final answer
   x = 1,204.03