To add the numbers \(-4.85\) and \(-2.54\):
\[ -4.85 + (-2.54) = -4.85 - 2.54 \]
Now, we can sum the absolute values:
\[ 4.85 + 2.54 = 7.39 \]
Since both numbers are negative, the result will also be negative:
\[ -4.85 - 2.54 = -7.39 \]
Therefore, the answer is:
\(-7.39\) (or negative 7.39).