The value would be 6335 at the 90th percentile.
The mean of this list is 5985.5 and the standard deviation is 273.06. The z-score for the 90th percentile is about 1.28.
With this information, we can write and solve the following equation to find the amount.
(x - 5985.5) / 273.06 = 1.28
x - 5985.5 = 349.5168
x = 6335.0168