Concept:
This is a letter-manipulation problem that requires a step-by-step transformation of a string of characters.
Step 1: Reversing the word.
Word:
P R O D U C T I O N
Reversed:
N O I T C U D O R P
Step 2: Identifying the target letter.
"Fourth from the last" in the reversed word:
P (last), R (2nd last), O (3rd last),
D (4th last).
Step 3: Applying the alphabetical shift.
The rule is: Replace with the "next letter in alphabetical order."
Next letter to
D is
E.
Thus, the resulting letter is E.