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Solution: We can see the circle divided into 4 parts.

The number which is in the circle below the number 4 is 16

This means 4^2 = 16

The number which is in the circle below the number 5 is 25

This means 5^2 = 25

The number which is in the circle above the number 7 is 49

This means 7^2 = 49

In this manner we can write, x = 6^2 = 36.

A2K6 B3L8 C4M10

The first one is A2K6

The next word is B3L8, means

After A the letter B came, After 2 there is 3 and after K there is L and after 6 there is 8.

Next word, C4M10

After B the letter C came, After 3 there is 4 and after L there is M and after 8 there is 10.

In this way we can write the fourth number as

After C there is D

After 4 there is 5

After M there is N

After 10 there is 12.

Therefore, the final number is D5N12.