1. The problem is to find the square root of 1901.388. 2. The square root function is defined as $\sqrt{x}$, which gives a number that when multiplied by itself equals $x$. 3. To find $\sqrt{1901.388}$, we can use a calculator or approximate by hand. 4. Using a calculator, $\sqrt{1901.388} \approx 43.6$. 5. Therefore, the square root of 1901.388 is approximately 43.6.