To calculate the sum:
\[ 2786.57 + 9.444 + 3108.01 = 4904.024 \]
In decimal notation, the answer is 4904.024.
In scientific notation, this can be expressed as:
\[ 4.904024 \times 10^3 \]
So the final answers are:
- Decimal notation: 4904.024
- Scientific notation: \(4.904024 \times 10^3\)