[task 18] on C Sharp

Hello, i have some problems with approximation on C#.

This is my answer:
31,0484224628371 9,66240764322412 477,247238710418 24,7394736842105 5,91607978309962 9010,24985430138 1538,24983737193 116,094519508056 51,0983210255662 69,9142331717941 30,2654919008431 338,788596046481

This is expected answer: 31.0484224628 9.66240764322 477.24723871 24.7394736842 5.9160797831 9010.2498543 1538.24983737 116.094519508 51.0983210256 69.9142331718 30.2654919008 338.788596046

I had differents in the 5 element, in the 9 element and in the 10 element but your approximation not so exact. I tried to use Math.Round, but still i had mistakes. How can i solve this problem? Algorithm is right. Probably.

Thank you and sorry for my English!

Code:

static private double GeroneMethod(string[] numbers)
    {
        double r = 1;
        double x = double.Parse(numbers[0]);
        int iteration = int.Parse(numbers[1]);

        for (int i = 0; i < iteration; i++)
        {

            r = (r + x / r)/2;
        }
        return r;
    }

Quandray, thank u! It was right decision! Sorry for my inadvertency.