how is the ending value calculated for the below problem. please show step by step. i understand the 1 st one but not for the second third and fourth ending values.

Time-Weighted Rate of Return Strubeck Corporation sponsors a pension plan for its employees. It manages part of the equity portfolio in-house and delegates management of the balance to Super Trust Company. As chief investment officer of Strubeck, you want to review the performance of the in-house and Super Trust portfolios over the last four quarters. You have arranged for outflows and inflows to the portfolios to be made at the very beginning of the quarter. Exhibit 5 summarizes the inflows and outflows as well as the two portfolios' valuations. In the table, the ending value is the portfolio's value just prior to the cash inflow or outflow at the beginning of the quarter. The amount invested is the amount each portfolio manager is responsible for investing. Exhibit 5 Cash Flows for the In-House Strubeck Account and the Super Trust Account Quarter 1 (5) 2 (5) 3 ($) 4 (5) In-House Account Beginning value Beginning of period inflow (outilow) Amount invested Ending value Super Trust Account Beginning value 4,000,000 1,000,000 5.000.000 6,000,000 6,000,000 (500,000) 5.500.000 5.775.000 5,775,000 225.000 6,000,000 6,720,000 6,720,000 (600,000) 6.120,000 5,508,000 10,000,000 13,200,000 12.240,000 5.659,200 Beginning of period intlow outilow) Amount invested Ending value 2,000,000 12,000,000 13.200.000 (1.200,000) 12,000,000 12.240,000 (7,000,000) 5,240,000 5,659,200 (400,000) 5,259,200 5,469,568