Tex. Gov't Code § 842.057

If any assets remain after the transfers are made under Sections 842.054, 842.055, and 842.056, the retirement system shall make a proportionate transfer to the individual account of each member not eligible to retire based on the ratio that the sum of the member's multiple matching credits and prior service credits bears to the total multiple matching credits and prior service credits of the class. The transfer to a member's individual account may not exceed 100 percent of the member's multiple matching credits and prior service credits.