It's quite a bit more than that. I get total taxes paid of:

Federal: 1240 + 0.12 * (50400 - 12401) + 0.22 * (105700 - 50401) + 0.24 * (201775 - 105771) + 0.32 * (256225 - 201776) + 0.35 * (640600 - 256226) + 0.37 * (1200000 - 640601) = 399938.83

State: 0.01 * 11078 + 0.02 * (26264 - 11080) + 0.04 * (41452 - 26265) + 0.06 * (57542 - 41453) + 0.08 * (72724 - 57543) + 0.093 * (371479 - 72725) + 0.0103 * (445771 - 371480) + 0.0113 * (742953 - 445772) + 0.0123 * (1200000 - 742954)

SF property tax on a $4.5M property: 1.18268325% for a total of about $53,220.75

Total: about $493K for an effective tax rate of about 41%, assuming this hypothetical SF resident is single and just purchased their $4.5M property this year.