Finding the Fourth Proportional to 2,196.75, 3,294.21 and 810.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.75 : 3,294.21 = 810.17 : x
2. Step 2: Convert to fraction form
   2,196.75/3,294.21 = 810.17/x
3. Step 3: Cross multiply
   2,196.75x = 3,294.21 × 810.17
4. Step 4: Simplify right side
   2,196.75x = 2,668,853.64
5. Step 5: Solve for x
   x = 2,668,853.64/2,196.75
6. Step 6: Final answer
   x = 1,214.91