William Prohasky was born at Wambat in 1856, the son of William and Emma née Carpenter. He married Florence Emily Brown in 1884, when his occupation was grocer. He seems to have had a number of business interests. He lived only a short time in Evans Street but continued to live in Port Melbourne and was very active in local affairs. There is a street named after him running north from Williamstown Road.
Florence and William had five children:
William James born in Port Melbourne in 1885 died 1962. He married Elizabeth Ann Robinson in 1910 and they had two children Emily Elizabeth born 1910 and William Edward born 1913
Albert Alfred born 1886, died in Evans Street 23 May 1888
Ethel Blanche born 1889 in Port Melbourne, she married Clement Wilks in 1913.
Henry born in Port Melbourne 1891 and died there the same year.
George Carpenter born 1892 in Port Melbourne, married Ella Wynne French, they had one son Donald Marshall born in 1929.One of Donald's sons, William James, was Master of the Sandridge Masonic Lodge in 1939.
There are still members of the Prohasky family living in Port Melbourne.
In the 1890s athletics events were very popular. Annual athletic meetings were held on the land at the Bend where the river and the bay joined. In 1889 a foot racing event was organised by the Cricket Club with both footballers and cricketers competing. Councillor Prohasky complained that during the running of foot races language of the most vile nature was used. (page 121, U'ren and Turnbbull)
In January 1889, at a time when Building Societies were popular William Prohasky became the Secretary of the newly formed South Suburban Building Society, which had its office at 166 Bay Street.
In 1889 there were serious moves in the Port Melbourne council to effect an amalgamation with the City of Melbourne. William Prohasky was one of the Councillors of the group advocating such an amalgamation. He was also a mayor of the City of Port Melbourne.