Note that the Matlab function for printing to the command window is fprintf, not printf. Note also that it doesn't make sense to use %1.2f since the 2 decimal places will override the 1 since the 1 is specifying a total field width of 1 but 2 decimal places requires a field width of at least 4, even it the number is less than one. I suggest reading the fprintf documentation more thoroughly (linked above).
Fm = 29801.98;
fprintf('The maximum force, F(m), on the piling is %.2f kN.\n', Fm / 1000); % <<< divide by 1000 to move decimal left 3 places
