Correct spelling for the English word "proponing" is [pɹəpˈə͡ʊnɪŋ], [pɹəpˈəʊnɪŋ], [p_ɹ_ə_p_ˈəʊ_n_ɪ_ŋ] (IPA phonetic alphabet).
The word proponing is derived from the Latin word proponere, which consists of two parts: pro meaning forward or in favor of, and ponere meaning to put or to place. In English, proponing is the present participle form of the verb propone, which means to put forward for consideration or to propose.