1. The problem is to find $\frac{3}{4}$ of 12. 2. The formula to find a fraction of a number is: $$\text{Fraction of a number} = \text{Fraction} \times \text{Number}$$ 3. Substitute the values: $$\frac{3}{4} \times 12$$ 4. Multiply the numerator by 12: $$\frac{3 \times 12}{4} = \frac{36}{4}$$ 5. Simplify the fraction by dividing numerator and denominator by 4: $$\frac{\cancel{36}^{9}}{\cancel{4}^{1}} = 9$$ 6. Therefore, $\frac{3}{4}$ of 12 is 9.