The output generated from the above tabular environment is as follows:

As you can see from the above output, the text does not wrap but just keeps going off out of the page.
Introducing the TabularX package
To fix this problem, we will use the tabularx package and use the tabularx environment:
1
\usepackage{tabularx}
The generic template of the tabularx environment is as follows:
1
\begin{tabularx}{w}{\X\X . . .\}
where:
- w : the desired width of the table
- X : marks each column for which the width is to be adjusted
This is now the output with the tabularx environment:

paritosh · 503 weeks ago
Jewish jobs · 475 weeks ago
GANESH MANJHI · 426 weeks ago
satish salunkhe · 426 weeks ago
centering
caption{My caption}
label{my-label}
begin{tabularx}{linewidth}{|X|X|X|X|}
toprule
Similarity measure & Posssibility alpha-value & Number of clusters & {Clusters with elements}, different clusters are separated by ';' \ midrule
Bart Kosko & 1 & 5 & {{1,2,4,5,10,11,12,13,14,15,18};{3,9};{6,7,8,17};{16,20};{19}} \
& 0.7818 & 1 & {{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}} \
Correlation & 1 & 5 & {{1,2,4,5,10,11,12,13,14,15,18};{3,9};{6,7,8,17};{16,20};{19}} \
& 0.8944 & 4 & {{1,2,4,5,10,11,12,13,14,15,18};{3,9};{6,7,8,16,17,20};{19}} \
& 0.8839 & 3 & {{1,2,4,5,6,7,8,10,11,12,13,14,15,16,17,18,20};{3,9};{19}} \
& 0.8677 & 2 & {{1,2,4,5,6,7,8,10,11,12,13,14,15,16,17,18,19,20};{3,9}} \
& 0.8416 & 1 & {{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}} \
Koczy & 1 & 5 & {{1,2,4,5,10,11,12,13,14,15,18};{3,9};{6,7,8,17};{16,20};{19}} \
& 0.8209 & 1 & {{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}} \
William & 1 & 5 & {{1,2,4,5,10,11,12,13,14,15,18};{3,9};{6,7,8,17};{16,20};{19}} \
& 0.804 & 1 & {{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}} \ bottomrule
end{tabularx}
end{table}
I am not getting the last column wrapped. please help me.