subfigures.tex

\documentclass[letterpaper,12pt,titlepage,final]{report}
\setlength{\marginparwidth}{0pt} % Please customize the margins as per your need
\setlength{\marginparsep}{0pt} % width of space between body text and margin notes
\setlength{\evensidemargin}{0.125in} 
\setlength{\oddsidemargin}{0.125in} 
\setlength{\textwidth}{6.375in} 
\raggedbottom
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{subfig}

\begin{document}
\begin{figure}[!ht]
    \centering
        \subfloat[]{\includegraphics[width=0.28\linewidth]{enter image 1 path here}}
        \qquad
        \subfloat[]{\includegraphics[width=0.28\linewidth]{enter image 2 path here}}
        \qquad
        \subfloat[]{\includegraphics[width=0.28\linewidth]{enter image 3 path here}}
        \caption{(a): caption for fig 1  (b): caption for fig 3 (c): caption for fig 3 }
    \label{fig:subfigname}
\end{figure}
\end{document}

An important note: the \qquad adds some space between the figures. Hence, I am using 28% of the width for an image. If you try to use 33.33% then you have to remove \qquad, but the images will have no space between them in that case.

A sample output is shown below:

Please let me know if you have any issues.