When a point \((x, y)\) is reflected across the x-axis, the new coordinates become \((x, -y)\).
Given the point at the bottom of the heart is \(\left(\frac{3}{14}, \frac{7}{12}\right)\), to find the coordinates of the reflected point across the x-axis, we simply negate the y-coordinate:
\[ \text{Reflected point} = \left(\frac{3}{14}, -\frac{7}{12}\right) \]
Thus, the coordinates for the point at the bottom of the heart in the reflected image are:
\[ \left(\frac{3}{14}, -\frac{7}{12}\right) \]