The distance from Mercury to Sun is 57,9 * 10⁶km.
The distance from Venus to Sun is 108,2 *10⁶km.
The distance from Earth to Sun is 149,6 *10⁶km.
57,9 *10⁶+ 108,2 *10⁶+ 149,6 *10⁶ ≈ 315,7 *10⁶km
The distance from Neptune to Sun is 4503 *10⁶km.
That means their combined distanceis less than
the distance from the Sun to Neptune.