This report is based on the study of 8115 four-prongs produced by the interactions of 2.7-BeVcπ- mesons with protons in the Lawrence Radiation Laboratory 72-in. hydrogen bubble chamber. The total four-prong cross section is found to be 5.01+/-0.12 mb, and the cross sections for each of the final states are: (π-pπ-π+, 1.83+/-0.05 mb), (π-pπ-π+π0, 1.53+/-0.04 mb), (π-nπ-π+π+, 0.67+/-0.02 mb), [π-pπ-π+(mπ0), (m>=2), 0.44+/-0.02 mb], and [π-nπ- π+π+ (mπ0), (m>=1), 0.54+/-0.02 mb]. The final-state π-pπ-π+ is dominated by the production of N*++(1238)[(42+/-4)%] and ρ0[(38+/-9)%], and the final-state π-nπ-π+π+ by the production of N*-(1238)[(72+/-12)%]. The fractions of ω and N*++(1238) production in the channel π-pπ-π+π0 are estimated to be (32+/-4)% and (20+/-5)%, respectively. Also presented are the effective-mass plots, production angular distributions, and decay angular correlations.