Answer:
Average Titan-Saturn distance is 759.23 miles only. 5-sd Saturn-Sun and Saturn-Earth average distances are the same 890.74 M miles. So, up to 5-sd, Sun/Earth-Titan. distance is 890.74 M miles.
Explanation:
The average distance of an inner planet from an outer planet is nearly the average distance of the outer planet from the Sun So, 5-sd Titan average distance, from both the Sun and the Earth, is 890.74 M miles, nearly.
Reference: wiki Titan and NASA Planetary Fact Sheet.