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I'd use bc instead of expr for this. With bc you can define the number of digits after the decimal point.
$ x=64
$ z=$(echo "scale=10; $x / 23789264 * 100" |bc)
$ echo $z
.0002690200
$ z=`expr...

In integer arithmetic, always do your multiples before your divides.
However with these numbers the answer is always going to be zero because the percentage is so small.

If you need to see the...

Try:
sed "s/,\([^']\)/.\1/3" infile

Unlike character classes, tr ranges are not delimited by square brackets. tr '[A-Z]' '[a-z]' is converting [ and ] into themselves, a silent, harmless error.

The unquoted version could trigger...

First we need to record field 1 in the NR==FNR part, which is done correctly, even though the assigment of $1 is superfluous and it could be written as:
{A[$1]; next}
Then in the second part field...