Follow these steps to find the required letter:

Step 1: Apply Alternate Capitalization

The original word is SATISFACTION. We write every alternate letter starting from the left end in capital letters, and the rest in small letters.

• Original Word: S A T I S F A C T I O N
• Position: 1 2 3 4 5 6 7 8 9 10 11 12
• Applying the rule: The letters at odd positions (1, 3, 5, 7, 9, 11) become capital, and letters at even positions (2, 4, 6, 8, 10, 12) become small.
• Resulting word: SaTiSfAcTiOn

Step 2: Reverse the Word

Reverse the word formed in Step 1:

• Word: SaTiSfAcTiOn
• Reversed Word: nOiTcAfsItAS

Step 3: Locate the Target Letter

Identify the letter that is eighth to the left of the letter fourth from the right in the reversed word nOiTcAfsItAS.

The reversed word has 12 letters.

1. Find the letter fourth from the right:
   • Counting from the right end of 'nOiTcAfsItAS': S (1st), A (2nd), t (3rd), I (4th).
   • The letter fourth from the right is 'I'.
2. Find the letter eighth to the left of 'I':
   • The reversed word is: n O i T c A f s I t A S
   • Using 1-based indexing from the left: The letter 'I' is at the 9th position (since 12 - 4 + 1 = 9).
   • We need the letter 8 positions to the left of the 9th position. This corresponds to position $9 - 8 = 1$.
   • The letter at the 1st position in 'nOiTcAfsItAS' is 'n'.

Therefore, the required letter is n.