Solving for the $k$, given the survival function for a newborn as: $S(t) = \frac{\left(121 - t\right)^{1/2}}{k},\; t\in\left(0, 121\right]$

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I'm doing an assignment and I can't seem to solve the following question:

Given the survival function for a newborn as:

$$S(t) = \frac{\left(121 - t\right)^{1/2}}{k},\; t\in\left(0, 121\right].$$

What is the value of $k$?