Calculating the expression step by step:

5×7 = 35

7×9 = 63

35 + 63 = 98

4988/9911 = 0.503

0.503 × 8 = 4.024

4.024/33 = 0.122

0.122 × 4 = 0.488

Therefore, the final result of the expression 5×7 + 7×9/4988/9911×8/33×4 is approximately 0.488.