How can I get the dollar weighted average of 2 periods?

Period One ( 30^th Dec 2011 to 30^th November 2012)

Period two ( 31^st Dec 2012 to 30^th Sep 2014)

cash ($) stocks ($) total ($) Russell 3000 with div. 412 9588 -10000 412 11852 12264 17546 3449.92 3571.83 3732.76 3866.13 412 17134 412 16904 17316 15934 412 3810.91 15522 13842 412 14254 412 16094 16506 412 14276 15416 15552 14688 15828 3638.04 3728.72 3769.23 3850.65 3955.86 412 412 412 17144 15964 17556 13846 3878.72 412 13434 22322 1854 24176 3874.14 3956.65 4179.75 1854 24667 26521 1854 4151.61 26022 27672 1854 Client flow 31-Dec-11 10000 30-Jan-12 0 28-Feb-12 0 31-Mar-12 0 30-Apr-12 0 31-May-12 0 30-Jun-12 0 31-Jul-12 0 31-Aug-12 0 30-Sep-12 0 31-Oct-12 0 30-Nov-12 0 31-Dec-12 10000 30-Jan-13 0 28-Feb-13 0 31-Mar-13 0 30-Apr-13 0 31-May-13 0 30-Jun-13 0 31-Jul-13 0 31-Aug-13 0 30-Sep-13 0 31-Oct-13 0 30-Nov-13 0 31-Dec-13 0 31-Jan-14 0 28-Feb-14 0 31-Mar-14 0 30-Apr-14 0 31-May-14 0 30-Jun-14 0 31-Jul-14 0 31-Aug-14 0 30-Sep-14 0 24168 25818 26986 1854 28840 4370.52 4452.47 4648.17 1854 29042 27188 25345 1854 27199 4543.36 4752.44 26645 1854 2945 28499 28370 2945 25425 31421 31512 33116 34366 34457 2945 2965 36081 4646.54 4799.28 5024.42 5131.71 5262.98 5105.86 5323.05 2965 28093 31058 2965 25819 22854 26271 29261 2990 2990 2990 3015 27417 30341 30407 33331 32756 31913 29741 5388.41 5349.34 5516.72 5650.94 5669.33 3015 28898 3015 27564 30579 26872 29912 5774.29 3040 3040 23316 26356 5775.62