7.6123 x 10 to the 5th

7.6123 \times 10^5 = 7.6123 \times 100000

Can you do the arithmetic?

When multiplying by 10 it's simple matter of moving your decimal point to the right, one move for each zero.

2.14 x 104

2.14 x 10^4

84.3% as a decimal
And
0.046 as a percentage