It's not clear to me why you are sorting, reversing etc. A simple while loop will suffice:

while (my @row = split / /, <DATA>) {
    $row[1] *= 1.1E3;
    printf("%E %E %E\n", @row);
}
exit;

__DATA__
1.10000E0 1.00000E0 1.00000E0
2.20000E0 2.00000E0 2.00000E0
3.30000E0 3.00000E0 3.00000E0
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