Given:
The objective is to round the numbers to nearest thousand place.
The thousand place of the number 4799 is 4.
By rounding off to thousand place, 4799 = 5000.
The thousand place of the number 12,200 is 2.
By rounding off to thousand place, 12,200 = 12,000.
The thousand place of the number 15231 is 5.
By rounding off to thousand place, 15,231 = 15,000.
Hence, the answers are 5000, 12000, 15000.