To estimate the price of the 2015 Toyota Fortuner I4 2.7L GX2 2WD (Base) with 251000 km mileage, I considered the following data points: 1) A similar 2015 model with 201000 km sold for 60500 SAR on 2024-07-25. 2) A 2016 model with 222000 km sold for 65500 SAR on 2023-12-31. 3) A 2017 model with 241000 km sold for 64000 SAR on 2024-02-27. 4) A 2015 model with 176000 km sold for 52500 SAR on 2024-05-11. 5) A 2014 model with 248000 km sold for 50000 SAR on 2024-02-26. 6) A 2013 model with 314000 km sold for 41000 SAR on 2024-08-22. Considering the mileage and condition of the target car, I adjusted the price slightly lower than the 2015 model with 201000 km and higher than the 2013 model with 314000 km. The listed prices of similar cars ranged from 48000 to 60500 SAR, which also supports this estimate.