To find out what percent 198.6 is of 192, you can use the following formula:
\[ \text{Percent} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the "Part" is 198.6 and the "Whole" is 192. Plugging in the numbers:
\[ \text{Percent} = \left( \frac{198.6}{192} \right) \times 100 \]
Calculating the fraction:
\[ \frac{198.6}{192} \approx 1.03541666667 \]
Now, multiply by 100:
\[ 1.03541666667 \times 100 \approx 103.541666667 \]
Rounding to the nearest thousandth:
\[ \text{Percent} \approx 103.542 \]
Thus, 198.6 is approximately \( \boxed{103.542} \) percent of 192.