Finding the Fourth Proportional to 859.83, 1,281.28 and 807.89

Step by Step Solution

1. Step 1: Write the proportion equation
   859.83 : 1,281.28 = 807.89 : x
2. Step 2: Convert to fraction form
   859.83/1,281.28 = 807.89/x
3. Step 3: Cross multiply
   859.83x = 1,281.28 × 807.89
4. Step 4: Simplify right side
   859.83x = 1,035,126.89
5. Step 5: Solve for x
   x = 1,035,126.89/859.83
6. Step 6: Final answer
   x = 1,203.88