Finding the Fourth Proportional to 859.82, 1,288.81 and 814.25

Step by Step Solution

1. Step 1: Write the proportion equation
   859.82 : 1,288.81 = 814.25 : x
2. Step 2: Convert to fraction form
   859.82/1,288.81 = 814.25/x
3. Step 3: Cross multiply
   859.82x = 1,288.81 × 814.25
4. Step 4: Simplify right side
   859.82x = 1,049,417.78
5. Step 5: Solve for x
   x = 1,049,417.78/859.82
6. Step 6: Final answer
   x = 1,220.52