Answer
From speaker #2, this point is a distance of $2.28~m$, $2.94~m$, or $3.60~m$.
Work Step by Step
We can find the wavelength:
$\lambda~f = v$
$\lambda = \frac{v}{f}$
$\lambda = \frac{343~m/s}{523~Hz}$
$\lambda = 0.66~m$
In order for constructive interference to occur, the path difference between the two speakers must have an integer number of wavelengths. Therefore, the possible distances from the speaker #2 must have the form $2.28~m \pm n~\lambda$. We can find the possible distances from speaker #2:
$d_0 = 2.28~m+(0)(0.66~m) = 2.28~m$
$d_1 = 2.28~m+(1)(0.66~m) = 2.94~m$
$d_2 = 2.28~m+(2)(0.66~m) = 3.60~m$
From speaker #2, this point is a distance of $2.28~m$, $2.94~m$, or $3.60~m$.
