Finding the Fourth Proportional to 1,144.33, 1,716.63 and 857.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.33 : 1,716.63 = 857.59 : x
2. Step 2: Convert to fraction form
   1,144.33/1,716.63 = 857.59/x
3. Step 3: Cross multiply
   1,144.33x = 1,716.63 × 857.59
4. Step 4: Simplify right side
   1,144.33x = 1,472,164.72
5. Step 5: Solve for x
   x = 1,472,164.72/1,144.33
6. Step 6: Final answer
   x = 1,286.49