IRA to ROTH conversion and moved Michigan to Virginia

Greetings,

I retired earlier in 2019 and moved from Michigan to Virginia.  All severance pay was collected during our 7 months (Jan-Jul) as a Michigan resident.  In December, while a resident of Virginia, I processed a conversion from my IRA to my ROTH.

To make math easy, lets say severance was $30,000 and IRA to ROTH IRA was $70,000.  For state tax purposes, what is the split of the $100,000 between the two states?

Thanks for your assistance,

Larry