Finding the Fourth Proportional to 2,196.87, 3,293.28 and 809.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.87 : 3,293.28 = 809.88 : x
2. Step 2: Convert to fraction form
   2,196.87/3,293.28 = 809.88/x
3. Step 3: Cross multiply
   2,196.87x = 3,293.28 × 809.88
4. Step 4: Simplify right side
   2,196.87x = 2,667,161.61
5. Step 5: Solve for x
   x = 2,667,161.61/2,196.87
6. Step 6: Final answer
   x = 1,214.07