I am trying to find out the measurement of a scalene triangle. Side a is unknown b is 107.38 and c which is the hypotenuse is 100.65. Please help

a hypotenuse is the side opposite the right angle in a right triangle

... it is also the longest side

two sides of a scalene triangle is NOT enough data to solve the triangle
... unless it is a right triangle
... then you can use Pythagoras (a^2+b^2=c^2)