| Regimental number | 6858 |
| Place of birth | Albert Park, Melbourne, Victoria |
| School | Christian Brothers (Catholic) School, Abbotsfield, Victoria |
| Religion | Roman Catholic |
| Occupation | Postal assistant |
| Address | 36 Davidson Street, Richmond, Victoria |
| Marital status | Single |
| Age at embarkation | 19 |
| Next of kin | Father, W H Van Prooyen, 36 Davidson Street, Richmond, Victoria |
| Previous military service | Served in the Senior Cadets. |
| Enlistment date | |
| Date of enlistment from Nominal Roll | |
| Rank on enlistment | Gunner |
| Unit name | Field Artillery Brigade 4, Battery 12 |
| AWM Embarkation Roll number | 13/32/1 |
| Embarkation details | Unit embarked from Melbourne, Victoria, on board HMAT A18 Wiltshire on |
| Rank from Nominal Roll | Bombardier |
| Unit from Nominal Roll | 4th Field Artillery Brigade |
| Other details from Roll of Honour Circular | Embarked 15 November 1915, served in Egypt, Tel el-kikor, Armentieres, Somme, Ypres, Zillebecke and performed duties of signaller, narrowly escaped death on more than once occasion. Eventually killed in his telephone dugout with two of his mates. |
| Fate | Killed in Action |
| Place of death or wounding | Ypres, Belgium |
| Age at death | 21 |
| Age at death from cemetery records | 21 |
| Place of burial | Perth Cemetery (China Wall) (Plot II, Row F, Grave No. 33), Zilkbeke, Belgium |
| Panel number, Roll of Honour, Australian War Memorial | 13 |
| Miscellaneous information from cemetery records | Son of James Henry VAN PROOYEN, 36 Davison Street, Richmond, Victoria |