(840 300 - 567 846)+(3 427 546-300 928)=

To solve the expression \((840,300 - 567,846) + (3,427,546 - 300,928)\), we will follow these steps:

1. Calculate \(840,300 - 567,846\): \[ 840,300 - 567,846 = 272,454 \]

2. Calculate \(3,427,546 - 300,928\): \[ 3,427,546 - 300,928 = 3,126,618 \]

3. Now, add the results of the two calculations: \[ 272,454 + 3,126,618 = 3,399,072 \]

Thus, the final result is: \[ \boxed{3,399,072} \]