PCO stands for Potential Change Order (construction management). Suggest new definition. This definition appears somewhat frequently and is found in the following Acronym Finder categories: 1  Business, finance, etc.
Quick Answer. The Roman numeral XIX is the number 19. X is the number 10, and I is the number one. When a lower number is placed in front of a larger number, it indicates subtraction; IX is the same as 10 minus one, which equals nine. The Ancient Romans used different letters to represent numbers.
Quick Answer. The Roman numeral XLVIII is the equivalent of the number 48. Roman numerals are actually upper case letters that are used to represent numbers. The basic Roman numerals are I, V, X, L, C, D and M, which stand for one, five, 10, 50, 100, 500 and 1,000, respectively. Continue Reading.