[Tex/LaTex] Multiple Alignment in equations

alignequations

The following equations need to be aligned in two spots. If I use the align* environment then the second column of alignment is pushed to the right edge of the page. I googled this and saw that alignat* was suggested. So I tried that, and now the numbers aren't aligned where the alignment symbol is. How should I align the following properly,

\documentclass{article}
\begin{document}
\begin{alignat*}{2}
    S(1)&=(1.05)S(0)=(1.05)(50000)&=52500\\
    S(2)&=(1.05)S(1)=(1.05)(52500)&=55125\\
    S(3)&=(1.05)S(2)=(1.05)(55125)&=57881.25\\
    S(4)&=(1.05)S(3)=(1.05)(57881.25)&\approx60775.31\\
    S(5)&=(1.05)S(4)\approx(1.05)(60775.31)&\approx63814.08\\
    S(6)&=(1.05)S(5)\approx(1.05)(63814.08)&\approx67004.78\\
    S(7)&=(1.05)S(6)\approx(1.05)(67004.78)&\approx70355.02\\
    S(8)&=(1.05)S(7)\approx(1.05)(70355.02)&\approx73872.77
\end{alignat*}
\end{document}

EDIT:
Here is an image of what I want. I created it using the same code but using spaces to align the equals signs.

Example

Best Answer

alignat alternates between right and left column alignment. So, you need to add an additional column to ensure that the last one is left aligned.

\begin{alignat*}{3}
    S(1)&=(1.05)S(0)=(1.05)(50000)         &&=2500\\
    S(2)&=(1.05)S(1)=(1.05)(52500)         &&=5125\\
    S(3)&=(1.05)S(2)=(1.05)(55125)         &&=7881.25\\
    S(4)&=(1.05)S(3)=(1.05)(57881.25)      &&\approx60775.31\\
    S(5)&=(1.05)S(4)\approx(1.05)(60775.31)&&\approx63814.08\\
    S(6)&=(1.05)S(5)\approx(1.05)(63814.08)&&\approx67004.78\\
    S(7)&=(1.05)S(6)\approx(1.05)(67004.78)&&\approx70355.02\\
    S(8)&=(1.05)S(7)\approx(1.05)(70355.02)&&\approx73872.77
\end{alignat*}
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