Analyzing Change in PBO Balance Gaap Company sponsors a defined benefit plan covering all employees. Benefits are based on years of service and compensation levels at the time of retirement. Gaap determined that as of December 31, its accumulated benefit obligation was $486,000 and its plan assets had a $522,000 fair value. Gaap's December 31 trial balance included a projected benefit obligation balance of $534,735. Assuming service cost of $90,000, interest cost of $3,375, and benefit payments of $8,640, what was the January 1 balance of PBO? PBO balance, Jan. 1 $ Check