The correct answer is 3517518. Its quite common with long multiplications during pilot aptitude tests (Math). A trick to save time is to divide the multiplier up into units of hundreds, tens and units.

For Example: 5479 X 642 (break down 642):

2 (units)

4 (tens)

6 (hundreds)

5479 X 2 =       10958

5479 X 40 =    219160

5479 X 600 = 3287400

Lets add 10958 + 219160 +3287400 = 3517518