To estimate the price of the 2017 Ford Taurus V6 3.5L SE (Base) with 191000 km mileage, I first looked at the selling prices of similar cars. The closest match is the 2015 Ford Taurus V6 3.5L SE (Base) with 162000 km sold for 50300 SAR on 2024-04-04. Considering the 2-year difference, I adjusted for depreciation (10% per year), which would increase the value of the 2017 model. The 2015 model with 113000 km sold for 48000 SAR on 2024-01-09, and the 2015 model with 150000 km sold for 54000 SAR on 2024-02-08. These prices suggest a range for the 2017 model. I also considered the listed prices: 56000 SAR for a similar 2017 model with the same mileage, 51500 SAR for a 2017 model with 197000 km, and 45000 SAR for a 2017 model with 221000 km. Given the higher mileage of the car in question, I adjusted the estimate downward from the highest listed price but above the lowest. Combining these data points, I arrived at a balanced estimate.