The ruling for the 'Absolute Total' (Al-Mawqoof Al-Mutlaq) when the three counts are entirely commensurable?
Chapter on the Roots of Inheritance Shares that Increase (Awl)
Al-Mughni
Book of Inheritance Shares (Farā'id)
Primary text
When the three counts are entirely commensurable, the configuration is termed the Absolute Total. There are two established methodologies for calculation. The first is the method of the Kufans, which involves taking the fraction of one count and reconciling it with the other two, reducing them to their fractions, and then proceeding with multiplication based on the relationship between these two reduced counts and the initial suspended count. The second methodology is that of the Basrans.
Supporting text
The Basran method involves suspending one of the three counts, then finding the common fraction (Wifq) between it and the other two counts, reducing them accordingly. Then, the relationship between the two suspended (reduced) counts is determined: if they are identical, one is multiplied by the suspended count; if proportional, the larger is taken; if disparate, one is multiplied by the other; if commensurable, the fraction of one is multiplied by the entirety of the other. This final result is then multiplied by the initially suspended count before multiplication by the original base. For example, suspending ten grandmothers, twelve uncles, and fifteen daughters results in reducing the twelve to six (half of ten) and the fifteen to three (one-fifth of ten), with three contained within six. Thus, six is multiplied by ten, resulting in sixty, which is then multiplied by the original base to yield 360.