Finding the Fourth Proportional to 2,171.32, 3,257.76 and 872.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.32 : 3,257.76 = 872.88 : x
2. Step 2: Convert to fraction form
   2,171.32/3,257.76 = 872.88/x
3. Step 3: Cross multiply
   2,171.32x = 3,257.76 × 872.88
4. Step 4: Simplify right side
   2,171.32x = 2,843,633.55
5. Step 5: Solve for x
   x = 2,843,633.55/2,171.32
6. Step 6: Final answer
   x = 1,309.63