Formatting Array column in fprintf

Hello everyone,

I have using the command of fprintf to create data .dat file as

        1  0.000000       0.000000       0.000000
        2  0.000000       0.000000       4.000000
        3  0.000000       0.000000       1.000000
        4  0.000000       0.000000       2.000000
        5  0.000000       11.000000       4.000000
        6  0.000000       12.000000       4.000000
        7  0.000000       13.000000       4.000000
        8  0.000000       14.000000       4.000000
        9  0.000000       15.000000       4.000000
        10  10.000000       16.000000       4.000000
        11  10.000000       17.000000       4.000000
        12  0.000000       18.000000       4.000000
        13  0.000000       12.000000       0.000000
        14  0.000000       11.000000       0.000000
        15  0.000000       10.000000       0.000000     etc.

Now i want to re-arrange to the same format as

         1  0.0000000       0.0000000       0.0000000
         2  0.0000000       0.0000000       4.0000000
         3  0.0000000       0.0000000       1.0000000
         4  0.0000000       0.0000000       2.0000000
         5  0.0000000       11.000000       4.0000000
         6  0.0000000       12.000000       4.0000000
         7  0.0000000       13.000000       4.0000000
         8  0.0000000       14.000000       4.0000000
         9  0.0000000       15.000000       4.0000000
        10  10.000000       16.000000       4.0000000
        11  10.000000       17.000000       4.0000000
        12  0.0000000       18.000000       4.0000000
        13  0.0000000       12.000000       0.0000000
        14  0.0000000       11.000000       0.0000000
        15  0.0000000       10.000000       0.0000000     etc.