Finding the Fourth Proportional to 2,198.22, 3,284.72 and 2,157.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,198.22 : 3,284.72 = 2,157.18 : x
2. Step 2: Convert to fraction form
   2,198.22/3,284.72 = 2,157.18/x
3. Step 3: Cross multiply
   2,198.22x = 3,284.72 × 2,157.18
4. Step 4: Simplify right side
   2,198.22x = 7,085,732.29
5. Step 5: Solve for x
   x = 7,085,732.29/2,198.22
6. Step 6: Final answer
   x = 3,223.40