To find what percent 255.6 is of 288, you can use the following formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
In this case, the part is 255.6 and the whole is 288. Plugging in the values gives:
\[ \text{Percentage} = \left( \frac{255.6}{288} \right) \times 100 \]
Now, calculate the fraction:
\[ \frac{255.6}{288} \approx 0.8861 \]
Now, multiply by 100 to convert it to a percentage:
\[ 0.8861 \times 100 \approx 88.61 \]
Rounding to the nearest tenth, we get:
\[ \text{Percentage} \approx 88.6% \]
Thus, 255.6 is approximately 88.6% of 288.