Dilution effect on multi-financing P/E

Dear, I cannot understand the dilution effect after multi-round financing.

For example,

of share for founder: 1mil.

Fraction of P/E on 1st round: 38%

of Share of P/E on 1st round: 612,903

and, fraction of P/E on 2nd round: 8.45%

of share of P/E on 2nd round: 148,870

–> then, I think that total fraction after 2nd round would (612,903+148,870)/(1mil.+612,903+148,870)=43.2%

But, the answer was 34.79%; 38%*(1-8.45%)

Please leaveprecious comments for me!

Thanks alot :smiley: