When asked how he felt, he entered a gospel song that thanked Jesus.
SA Idols Proverb presenter said the event had received a record of more than 142 million votes.
While Yanga gave the best on live shows in Johannesburg, the Delft community came out with the support of thousands.
A fan park event was held on the Voorbrug sports field with rows of local singers and dancers as everyone waited anticipated for the final.
The event was organized by 13 board members Michelle Adonis and a group of supporters who called themselves Team Yanga.
Team Yanga has been supporting the young singer since she entered the competition through a campaign effort that saw them go door-to-door across the community with a branded Yanga shirt, encouraging people to vote.
Adonis said: "He is our daughter. There are many negative things related to Delft, we need to tell this positive story.
"This is an inspiration for our youth." Bulelwa Manzana's family friend says Yanga always likes to sing.
"He has been singing since a young age and he always wants to enter Idols, but he is too young.
"Winning this competition will change his life for the better."
Manzana said he came from a simple family who loved God.
"He is one of four daughters," Manzana said.
Residents Olivia Ochan said that she was touched by what Yanga upheld.
"I came out to support him because I saw what kind of person he was. He is a very spiritual person.
"For a 17-year-old teenager, I admire him because he can be a very good example for all our teenagers in Delft and especially our young girls. I like what he fights for."