1. The problem is to find 21% of 290.04. 2. The formula to find a percentage of a number is: $$\text{Percentage value} = \frac{\text{percentage}}{100} \times \text{total value}$$ 3. Substitute the values into the formula: $$\frac{21}{100} \times 290.04$$ 4. Calculate the multiplication: $$= 0.21 \times 290.04$$ 5. Multiply to get the result: $$= 60.9084$$ 6. Therefore, 21% of 290.04 is approximately 60.9084.