The calculated distance (air line) between Proletarsk and Rostov-na-Donu is approximately 101 miles respectively 163 kilometers.
By car or train, the actual journey to Rostov-na-Donu is certainly longer, as only the direct route (as the crow flies) between Proletarsk and Rostov-na-Donu has been calculated here.
Air line (approximately)
163 kilometers
88 nautical miles