How figure derived

Initial recognition

43,731*24 months= 10,49,544₹

The current leases treatment recognises RIGHT TO USE ASSET and measured initially at full value of the minimum lease payments along with lease liability (payments).

RTU Asset a/c 10,49,544₹

To Lease liability 10,49,544₹

I just remembered that GST is an indirect cost. So, minimum lease payments + direct costs associated with lease - Lease incentives should be recognised initially. That means

RTU Asset a/c 8,13,600 INR

To Lease lability a/c 8,13,600 INR

There is one more thing to work on, you need to discount the future lease payments into PV values. For which, one needs the PV discount rate.