To simplify this expression, let's break it down step by step:

Start by evaluating the exponent term first:
9^(log(3)7) = 9^(log(3)7) = 9^(log(3)7) = 9^(log(7)/log(3)) = 9^(log(7)/log(3)) = 9^(log(7)/log(3)) = 7.471

Next, substitute the value back into the expression:
3(1 + 7.471)^log(50)3 = 3(8.471)^log(50)3

Evaluate the exponentiation:
log(50)3 = log(3)50 = log(3) log(50) = log(3) 1.699 = 0.93

Substitute this value back into the expression:
3(8.471)^0.93

Finally, evaluate the exponent term:
(8.471)^0.93 = 9.084

Multiply by 3:
3 * 9.084 = 27.252

Therefore, 3(1+9^log(3)7)^log(50)3 is approximately equal to 27.252.