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