To solve this expression, we follow the order of operations (PEMDAS/BODMAS).
First, we perform the division within each fraction, then multiply the resulting fractions together.
\[
\frac{1}{20938494839} \times \frac{10293}{109237393}
\]
Let's compute each part separately:
\[
\frac{1}{20938494839} \approx 4.773 \times 10^{-11}
\]
\[
\frac{10293}{109237393} \approx 9.420 \times 10^{-5}
\]
Now, we multiply these two results together:
\[
(4.773 \times 10^{-11}) \times (9.420 \times 10^{-5}) = 4.497 \times 10^{-15}
\]
So, \( \frac{1}{20938494839} \times \frac{10293}{109237393} \) is approximately \(4.497 \times 10^{-15}\).