(6121.23N)/(78.54x10-^6 )

(6121.23N) / (78.54x10-^6 )

First since we have some scientific notation present, I'll turn this whole thing into scientific notations:

= ([6.12123 * 10³]N) / (7.854 * 10^-5)

Now seperate out the magnitudes and combine them

= [(6.12123 / 7.854) * 10^3--5] N

Complete the fraction

= 0.7793773873185638  * 10⁸ N

And now round it for simplicity and make it comply with Scientific Notation

= 7.794 * 10⁷ N