How to Adjust the Content Display When Using Enumerate

I am using the enumerate package.

I have figured out how to add opening and closing parentheses when displaying the number of each item, but I have not been able to figure out how to adjust where the second (and all subsequent) content lines of each item are displayed. More specifically, given the code

\documentclass[12pt]{book}

\usepackage{enumerate}
\usepackage{lipsum}
\begin{document}
\thispagestyle{empty}

\begin{enumerate}[{(1.)}]
\item \lipsum[1]
\item \lipsum[2]
\item \lipsum[3]
\end{enumerate}

\end{document}


which produces the output

I would like, if possible, to have all lines following the first, begin under the right-hand parenthesis (or thereabouts) instead of directly underneath where the first sentence begins.

Is there a way to do this---so that I may adjust from time to time (within the same document) where all subsequent lines after the first line begins?

It's easier to achieve this with enumitem since you can adjust the horizontal spacing as an optional argument as well.

\documentclass{article}

\usepackage{enumitem,lipsum}

\begin{document}

\begin{enumerate}[label={(\arabic*.)},itemindent=1em,leftmargin=1em]
\item \lipsum[1]
\item \lipsum[2]
\item \lipsum[3]
\end{enumerate}

\end{document}