36.36 is thirty-six and thirty-six hundredths.
36.63 is thirty-six and sixty-three hundredths.
The whole parts are the same. They are both 36.
The decimal parts are 0.63 and 0.36.
Sixty-three hundredths is greater than thirty-six hundredths.
Since 0.63 is greater than 0.36, 36.63 is greater.