Finding the Fourth Proportional to 1,571.52, 2,168.69 and 872.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.52 : 2,168.69 = 872.90 : x
2. Step 2: Convert to fraction form
   1,571.52/2,168.69 = 872.90/x
3. Step 3: Cross multiply
   1,571.52x = 2,168.69 × 872.90
4. Step 4: Simplify right side
   1,571.52x = 1,893,038.66
5. Step 5: Solve for x
   x = 1,893,038.66/1,571.52
6. Step 6: Final answer
   x = 1,204.59