To simplify the expression \( \frac{4.6 \times 10^5}{2,300,000} \), we first express \(2,300,000\) in scientific notation:
\[ 2,300,000 = 2.3 \times 10^6 \]
Now we can rewrite the original expression as:
\[ \frac{4.6 \times 10^5}{2.3 \times 10^6} \]
Next, we can separate the coefficients and the powers of ten:
\[ \frac{4.6}{2.3} \times \frac{10^5}{10^6} \]
Calculating \( \frac{4.6}{2.3} \):
\[ \frac{4.6}{2.3} = 2 \]
Next, we calculate \( \frac{10^5}{10^6} \):
\[ \frac{10^5}{10^6} = 10^{5-6} = 10^{-1} \]
Combining these results, we have:
\[ 2 \times 10^{-1} \]
Thus, the expression \( \frac{4.6 \times 10^5}{2,300,000} \) simplifies to:
\[ 2 \times 10^{-1} \]
In conclusion, the expression that represents the quotient is:
\[ \boxed{2 \times 10^{-1}} \]