long long long double

hi there,
question about long long long double... ><
if i has an equation:
x = y / z
which will result x = 0.121212123434645712323543464523423534645....
is there any others way to store x? beside long long long double?
or should i convert x to 0.121?
What is a long long long double ans where can I get one?
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