The hosts won the series 2-1 and the world's two top-ranked teams will do battle again on June 7-11 at The Oval in the World Test Championship final
India also confirmed their place in the World Test Championship final against Australia in June following Sri Lanka's two-wicket loss to New Zealand in Christchurch earlier in the day
Opener Gill, playing his second match of the series, featured in three 50-plus partnerships to help India, who lead the series 2-1, reach 289-3 at stumps.
Smith led Australia between 2014 and 2018 before he was stripped off the honour following a ball-tampering scandal in South Africa
A winning target of 76 may sound a cakewalk but Australia will have to score those runs on a track where 30 wickets have tumbled on the first two days of the spin-dominated contest.
Milking 'home advantage' is commonplace in international cricket and India have never shied away from preparing pitches that would suit their spinners
The tourists were 156-4 at stumps after Usman Khawaja hit a gritty 60 to drive his team's reply on a viciously turning pitch in Indore
Ashwin and Jadeja destroyed Australia's batting to set up a six-wicket victory in Delhi on Sunday and give India an unassailable 2-0 lead in the four-Test series