The inverse of $ z $ is:
$$ z^{-1} = \frac{ 75006000 }{ 10135786337 }+\frac{ 443948000 }{ 10135786337 }i $$We will denote the inverse of $ z $ as $ z_1 $. The inverse can be found in three steps.
Step 1: Rewrite complex number as its reciprocal
$$ z_1 = \frac{1}{ \frac{ 37503 }{ 10000 }-\frac{ 110987 }{ 5000 }i } $$Step 2: Multiply top and bottom by complex conjugate of $ z $
$$ z_1 = \frac{1}{ \frac{ 37503 }{ 10000 }-\frac{ 110987 }{ 5000 }i } \cdot \frac{ \frac{ 37503 }{ 10000 }+\frac{ 110987 }{ 5000 }i }{ \frac{ 37503 }{ 10000 }+\frac{ 110987 }{ 5000 }i } $$Step 3: Simplify
$$ z_1 = \frac{ \frac{ 37503 }{ 10000 }+\frac{ 110987 }{ 5000 }i }{ \frac{ 10135786337 }{ 20000000 } } $$$$ z_1 = \frac{ \frac{ 37503 }{ 10000 } }{ \frac{ 10135786337 }{ 20000000 } } + \frac{ \frac{ 110987 }{ 5000 } }{ \frac{ 10135786337 }{ 20000000 } } \cdot i$$$$ z_1 = \frac{ 75006000 }{ 10135786337 }+\frac{ 443948000 }{ 10135786337 }i $$