The pattern is that the next number is a division of ten, or the previous number is a multiple of ten
When you multiply 8,570 (given as a second number in the set) by ten it will be 85,700, that’s your first number . The next blank is the third number, divide the second number by 10, it’s going to be 857. The last blank is hence, 8.57 divided by ten, which is 0.857