Which is the largest fourth spoken language in world?

This question is a bit tricky! There's no single definitive answer for the "largest fourth spoken language" because it depends on what criteria you're using.

Here's why:

* Native speakers vs. total speakers: Do we count only people who speak the language as their first language, or include all those who speak it as a second, third, or foreign language?

* Different sources have different data: Different organizations use different methodologies and data collection methods, leading to slightly varying results.

Some possibilities for the "fourth largest" based on different factors:

* Native speakers:

* Hindi is often considered the fourth most spoken language in the world, with a large native speaker base in India.

* Arabic is also a strong contender, depending on the source.

* Total speakers:

* English is the undisputed top language when considering total speakers, followed by Mandarin Chinese, Hindi, and Spanish.

* Arabic might take the fourth spot in this category due to its widespread use across the Middle East and North Africa.

Ultimately, it's hard to definitively say which language is the "largest fourth" without specifying the exact criteria.