The question relates to a problem which description is missing, but I can answer it assuming all the data is present.
Answer:
[tex]m=20,461,723\ Kg[/tex]
Explanation:
Proportions
We know the line is 845 miles long. Let's convert it to feet
[tex]845 * 5280 =4,461,600 \ ft[/tex]
The weight per ft of the 4 conductors is
[tex]WPF=4*2526\ lb/1000\ ft=10104\ lb/1000\ ft=10.104\ lb/ft[/tex]
Since we have 4,461,600 ft of conductor, the total weight is
[tex]W=10.104\ lb/ft\times 4,461,600 \ ft=45,080,006.4\ lb[/tex]
Note: The unit 'lb' is understood as lb-f in this context, since it's an unit of weight, that is a force.
Converting to Newton
[tex]W=45,080,006.4\ lbf * 4.4482 = 200,524,884\ Nw[/tex]
Since W=m.g, we find the mass in kilograms by dividing by 9.8
[tex]m=200,524,884\ Nw/9.8=20,461,723\ Kg[/tex]
[tex]\boxed{m=20,461,723\ Kg}[/tex]
