Sunderland Placepot greyhounds

I am not sure how the dividends are worked out.

Can anyone help?

Pool Total 1885                           

1               0.35
2               1.20
3               2.90
4               3.70
5               0.95

(What do the numbers above to the right of 1, 2, 3, 4 and 5 mean)

Total          9.10

Winnings units 1.30

Dividend 1058.50 (How is that worked out? 1885 divided by 1.30 is more than 1058.50)