Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Province | Population (2011) | Percentage | Population Estimate (2013) |
| --- | --- | --- | --- | --- |
| 1 | Gauteng | 12272263.0 | 23.7 | 12728400.0 |
| 2 | KwaZulu-Natal | 10267300.0 | 19.8 | 10456900.0 |
| 3 | Eastern Cape | 6562053.0 | 12.7 | 6620100.0 |
| 4 | Western Cape | 5822734.0 | 11.2 | 6016900.0 |
| 5 | Limpopo | 5404868.0 | 10.4 | 5518000.0 |
| 6 | Mpumalanga | 4039939.0 | 7.8 | 4128000.0 |
| 7 | North West | 3509953.0 | 6.8 | 3597600.0 |
| 8 | Free State | 2745590.0 | 5.3 | 2753200.0 |
| 9 | Northern Cape | 1145861.0 | 2.2 | 1162900.0 |
| South Africa | South Africa | 51770561.0 | 100.0 | 52982000.0 |
Question:
What is the lowest 2013 population estimate of the province with a 23.7 percentage?
Answer:
12728400.0