Citrus species/ hybrids- Flower Show, Mumbai,Mumbai-DSCN0903.JPG?part=0.1&view=1&vt=ANaJVrHc1-GdyOjV9i8VO_pVGm2Z-xkLNNZS9uHnrMO9jvWJCXQeNr1Gr-h-bDn7XcBz96CWVOemALDENtu4De68UCfuS7OYskt92SvyvUy2WWd72uYUvj8
Citrus Fruit For ID : Flower Show,Mumbai : 220914 : AK-29 : 4 posts by 3 authors. Attachments (1).
This large fruit was seen at the flower show in Jijamata Udyan.
Id please.

May be Citrus maxima.
As you have not provided any other inputs; can be Pomelo-Citrus maxima / grandis or it can be Grape fruit-Citrus x paradisi.
Thanks for possible ids. I checked for more pictures, but couldn't find.
Only remember the size of the fruit to be big.