How can I find Period of Signal

I have a signal which is X in code. I want to find this period. The ans is 0.0049 but I am not sure it is true. Is it the correct way to find period?

%%Time specifications:
   Fs = 8000;                   % samples per second
   dt = 1/Fs;                   % seconds per sample
   StopTime = 0.25;             % seconds
   t = (0:dt:StopTime);     % seconds
   %%Sine wave:
   Fc1 = 50; % hertz
   Fc2 = 200;
   Fc3 = 400;
   Fc4 = 600;
   x1 = sin(2*pi*Fc1*t+pi);
   x2 = 0.5*cos(2*pi*Fc2*t + (pi/2));
   x3 = (1/3)*sin(2*pi*Fc3*t + (pi/3));
   x4 = 0.25*cos(2*pi*Fc4*t + (pi/4));
   X = x1+x2+x3+x4;
  ac=xcorr(X,X);
  [~,locs]=findpeaks(ac);
  mean(diff(locs)*dt)

Answer 1

[madhan ravi]

See https://www.mathworks.com/matlabcentral/answers/386863-how-do-i-find-the-period-or-frequency-of-a-signal#answer_308851