Answer
$y=657$ attempts
Work Step by Step
Typical percentage problem:
What percent ($n$, as a decimal number) of (the base amount $y$) is $x?$
Translated:$\quad n\cdot y=x$
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Here, What percent ($n$, as a decimal number) of ($y=?$) is ($x=197$)$?$
Translated:$\quad 0.712\cdot y=468$
($ 71.2\%$ converted to decimal notation is $0.712)$
... divide the last equation with $0.712$
$y=657$ attempts