28,7+28,4+25,3+24,3+27,8+26,7+28,7+22,9+23,2+28,0+22,0

To calculate the sum of the numbers you provided, let's list them and add:

28.7 + 28.4 + 25.3 + 24.3 + 27.8 + 26.7 + 28.7 + 22.9 + 23.2 + 28.0 + 22.0

Now, calculating step by step:

1. 28.7 + 28.4 = 57.1
2. 57.1 + 25.3 = 82.4
3. 82.4 + 24.3 = 106.7
4. 106.7 + 27.8 = 134.5
5. 134.5 + 26.7 = 161.2
6. 161.2 + 28.7 = 189.9
7. 189.9 + 22.9 = 212.8
8. 212.8 + 23.2 = 236.0
9. 236.0 + 28.0 = 264.0
10. 264.0 + 22.0 = 286.0

The total sum is 286.0.