See as per the definition of Percentile, you have a score which is greater than 94% of the student appear for the examination. Now to calculate, the expected rank, we can use the JEE MAINS rank predictor tool from career360, which so devised that it can predict the rank with low errors. (predicting actual rank can't be possible because, every year the percentile vs rank changes). As per the predictor, the rank which you can expect with 94.78 percentile score is around 53401 - 60030.

For JEE MAINS college predictor consider the link below:

I hope this helps. Wish you a great eve!