To find the missing number, we can analyze the given equation:
\[ 10^{10} \times x = 75,300 \]
We need to isolate \( x \):
- Divide both sides of the equation by \( 10^{10} \):
\[ x = \frac{75,300}{10^{10}} \]
- Calculate \( 10^{10} \):
\[ 10^{10} = 10,000,000,000 \]
- Substitute \( 10^{10} \) into the equation:
\[ x = \frac{75,300}{10,000,000,000} \]
- Perform the division:
\[ x = 75,300 \div 10,000,000,000 = 0.00000753 \]
Thus, the missing number, \( x \), is:
\[ \boxed{0.00000753} \]