Anuradha, Priya, Riya, Zeeshan, Sneha and Amrit are sitting in a row. Riya and Anuradha are sitting at extreme ends while Zeeshan is sitting to the immediate right of Riya. Who is sitting fourth to the right of Zeeshan?

Let's position the 6 individuals based on the statements from left to right:
Riya and Anuradha sit at the extreme ends.

Zeeshan is sitting to the immediate right of Riya. This means Riya must be at the leftmost end, and Anuradha is at the rightmost end.

So the row structure looks like this:
Position 1 (Left end): Riya
Position 2: Zeeshan
Position 3: [Empty]
Position 4: [Empty]
Position 5: [Empty]
Position 6 (Right end): Anuradha

We need to find who sits fourth to the right of Zeeshan (Position 2):

1st to the right: Position 3

2nd to the right: Position 4

3rd to the right: Position 5

4th to the right: Position 6 ⟹ Anuradha

Hence, Anuradha is sitting fourth to the right of Zeeshan.