Arranging in Descending Order:
1. 6√26
2. 4√8
3. 3√5
4. √2

Explanation:
- First, we compare the numbers under the square root sign (√) to determine their magnitudes. The larger the number under the square root sign, the larger the overall value.
- In this case, the numbers under the square root sign are 26, 8, 5, and 2.
- Among the given numbers, 6√26 has the largest number under the square root sign, making it the largest value.
- Next, we compare the remaining numbers based on their square roots. Since the square root of 26 is greater than the square root of 8, 4√8 comes next.
- Then, we compare the square root of 5 and the square root of 2. Since the square root of 5 is greater, 3√5 comes before √2.
Therefore, the numbers arranged in descending order are 6√26, 4√8, 3√5, and √2.