To find the numerical value of the largest section in the pie graph, you can simply calculate 53% of 1000.
\[ \text{Value} = \frac{53}{100} \times 1000 \]
\[ \text{Value} = 0.53 \times 1000 \]
\[ \text{Value} = 530 \]
So, the numerical value of that section is 530.