I have obtained Pivot levels which are different from the levels you have mentioned above. I have applied the universal formula for determining the Pivot levels. The results that I have obtained are :
R3 : 4911.20, R2 : 4864.30, R1 : 4821.05
S3 : 4640.75, S2 : 4684.00, S1 : 4730.90
and PIVOT : 4774.15.
Though these levels are guides for a trader to keep in mind the potential movements of Price/Index movements in the next day trading time, however, mathematical accuracy of those levels is also an important factor.