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:
|  | UAL | UAL | UAL | UAL |
| --- | --- | --- | --- | --- |
|  | 2017 | 2017 | 2016 | 2016 |
|  | High | Low | High | Low |
| 1st quarter | $    76.75 | $    64.16 | $    61.41 | $    42.17 |
| 2nd quarter | 83.04 | 67.55 | 58.90 | 37.41 |
| 3rd quarter | 81.39 | 57.34 | 54.53 | 37.64 |
| 4th quarter | 69.62 | 56.51 | 76.80 | 51.34 |
Question:
What is the lowest stock rate of UAL in the 4th Quarter of 2017?
Answer:
56.51