Each vowel in the word 'DESTROY' is changed to the letter following it in the English alphabetical order and each consonant is changed to the letter preceding it in the English alphabetical order. If each letter, thus formed, is arranged in alphabetical order, which letter will be fifth from the right end? ​​

DESTROY

Vowel is changed to the letter following it in the English alphabetical order.

Each consonant is changed to the letter preceding it in the English alphabetical order.

​Let's first apply the given transformation to the word 'DESTROY':

​$$D \to C \\E \to F \\S \to R \\T \to S \\R \to Q \\O \to P \\Y \to X$$

So, the transformed word is 'CFRSQPX'.

Now, let's arrange these letters in alphabetical order:

Counting from the right end, the fifth letter is P.​​​