Electricity - question for bobpursley

www.jiskha.com/questions/1791803/In-a-series-circuit-there-are-4-resistor-with-one-battery-cell-theres-no-diagram
on the website above this message, you said:
On r3, get current by P=I^2/R
Then if you circuit current, so you know Rtotal (100/current)
then you know R4 (Rtotal-r1-r2-r3)
then you know V4 (IR4)
total power= I^2 * Rtotal or you can add each IV up for all four resistors.

Can you show me how to do it please

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