There seem to be 2 cases which would help me to complete some sage code
1) Complex Fractions $fraction * I \ $ like $$ 4.4747038862752024491936821935697961325*I $$ so that one obtains the fraction $$\frac{3344161}{747348} I$$
2) Numbers of the form $number* {N}^{\pm \frac{1}{2}} $ like , $$\frac{3623680665059}{\sqrt{38}}, 179398994850 \sqrt{38} $$ where one does not know $N=38$ in advance.
Using the function .canonicalize_radical() , I get the error.
PARI/GP ERROR: * at top-level: sage[1296]=canonicalize_radical(sage[1264]) ^-------------------------------- ** not a function in function call
I hope there is a solution in sage