Reconstucting a signal using Sinc function

i have sampled a signal and im trying to reconstruct the signal according to the ideal sinc filter idea.

so i have a signal lets say

and i have sampled it in 50hz for the sampled signal -Xs

and the countinous signal is sampled at 400hz-Xc

then i put the samples from Xs to fit the Xc where for each point without Xs is get a zero . that gave me (time domain to be clear)

now i want to reconstruct the signal from the formula :

and im not sure how the original signal will come from this application.

thank you very much. if the question was not specific enough tell me.

Tc=1/400,Ts=1/50;
ts=0:Ts:0.4;
tc=0:Tc:0.4;
Xs10=cos(2*pi*1*f0*ts);
Sinc11=zeros(length(Xs10));
for i=0:length(Xs10)
    Sinc1=Xs10(i+1).*sinc(pi*(Tc-i/50)*50);
    Sinc11=Sinc11+Sinc1;
end
plot(tc,Sinc1);