DISTRIBUTE A VALUE ACROSS MULTIPLE VALUES

[g_f]

GOOD EVENING, I HAVE A TABLE OF SKU OF WHICH I HAVE SALES. ON THESE SALES. I CALCULATED WITH THE DAX THE PERCENTAGE SHARE.TO THESE VALUES I HAVE TO ADD A NATIONAL VALUE ( DISTINCT PER SKU) TO DISTRIBUTE AND ADD TO THE CURRENT VALUES. I CAN'T. CAN ANYONE HELP ME?

EXAMPLE : 

	ROMA	MILANO	TORINO	TOTAL		ROMA	MILANO	TORINO	TOTAL
SKU_1	96	73	3	172		56%	42%	2%	100%
SKU_2	37	24	65	126		29%	19%	52%	100%
SKU_3	97	63	61	221		44%	29%	28%	100%
SKU_4	86	46	85	217		40%	21%	39%	100%
SKU_5	40	7	77	124		32%	6%	62%	100%
SKU_6	96	69	27	192		50%	36%	14%	100%
SKU_7	99	69	3	171		58%	40%	2%	100%
SKU_8	28	11	7	46		61%	24%	15%	100%
SKU_9	75	9	45	129		58%	7%	35%	100%
SKU_10	72	90	95	257		28%	35%	37%	100%
SKU_11	78	46	96	220		35%	21%	44%	100%
SKU_12	35	29	35	99		35%	29%	35%	100%
SKU_13	55	6	86	147		37%	4%	59%	100%
SKU_14	97	17	88	202		48%	8%	44%	100%
	NAZIONALE
SKU_1	150
SKU_2	200
SKU_3	118
SKU_4	122
SKU_5	104
SKU_6	125
SKU_7	119
SKU_8	119
SKU_9	119
SKU_10	141
SKU_11	139
SKU_12	119
SKU_13	109
SKU_14	143

[lbendlin]

Do you need to distribute the national numbers across the three cities according to their weight?  Does it need to result in integer numbers or are fractions acceptable?