Gaylon and Tyna Knowlton of Big Spring announce the engagement of their daughter Porscha Knowlton of Big Spring to Ethan Densman of Coleman. The bride-elect is a 2007 graduate of Big Spring High School. She graduated from Angelo State University in May 2011 with a masters degree in professional accountancy. She is employed at Armstrong, Backus & Co., LLP. The prospective groom is the son of Mr. and Mrs. Jackie Densman of Coleman. He is a 2007 graduate of Coleman High School. He is employed at MultiChem, a Halliburton Service.The couple plans to exchange wedding vows Oct. 6, 2012, at Fort Concho in San Angelo.