Looks like a few hours walk and $250 for a guide:
https://www.mountainproject.com/route/110735330/standard-rou...
https://www.mountainproject.com/route/110735330/standard-rou...
Even though the air around equator is thicker, you would most probably already feel very bad at the carpark at 4800m, if you would come up straight from the capital. I'd say some 5-7day acclimatization prior to this should be enough for most fit people.