Finding the Fourth Proportional to 2,189.82, 3,286.18 and 957.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.82 : 3,286.18 = 957.28 : x
2. Step 2: Convert to fraction form
   2,189.82/3,286.18 = 957.28/x
3. Step 3: Cross multiply
   2,189.82x = 3,286.18 × 957.28
4. Step 4: Simplify right side
   2,189.82x = 3,145,794.39
5. Step 5: Solve for x
   x = 3,145,794.39/2,189.82
6. Step 6: Final answer
   x = 1,436.55