To determine if \( d = 111 \) is a solution to the equation
\[ 1 = \frac{d}{111}, \]
we can substitute \( d \) with \( 111 \):
\[ 1 = \frac{111}{111}. \]
Now, we simplify the right side:
\[ \frac{111}{111} = 1. \]
Thus, the equation becomes
\[ 1 = 1, \]
which is true. Therefore, \( d = 111 \) is indeed a solution to the equation.