The given information is:
-The bag contained 1 kernel of corn the first day.
-The bag contained 2 kernels of corn the second day.
-The bag contained 4 kernels of corn the third day.
-Each kernel of corn weighs 0.07 grams.
As can be observed, the number of kernels of corn doubles each day.
Then, we can find a formula to find the number of kernels at day d.
The formula is given by:

Where a is the kernel of corn on day 1, r is the rate of increase, which is 2 (it doubles) and d is the number of days.
Thus, on day 26, the values are a=1, r=2 and d=26. Replace these values and find K:

Now, as each kernel of corn weighs 0.07 grams, we need to multiply the number of kernels by this weight and find the total weight of the bag:

On the day 26th, the bag will weigh 2348810.24 grams.