translations:

Sahih International
Indeed, your Lord is Allah , who created the heavens and earth in six days and then established Himself above the Throne.
Muhsin Khan
Indeed your Lord is Allah, Who created the heavens and the earth in Six Days, and then He Istawa (rose over) the Throne(really in a manner that suits His Majesty).
Pickthall
Lo! your Lord is Allah Who created the heavens and the earth in six Days, then mounted He the Throne.
Yusuf Ali
Your Guardian-Lord is Allah, Who created the heavens and the earth in six days, and is firmly established on the throne (of authority):
Shakir
Surely your Lord is Allah, Who created the heavens and the earth in six periods of time, and He is firm in power;
Dr. Ghali
Surely your Lord is Allah, Who created the heavens and the earth in six days. Thereafter He leveled Himself upon the Throne(How He did so is beyond human understanding).