Answer:
52920
Explanation:
You have described the Least Common Multiple (LCM) of the three numbers. That can be found by considering their unique factors. The LCM is the product of the unique factors, 2³, 3³, 5, 7².
315 = 3×3×5×7
378 = 2×3×3×3×7
392 = 2×2×2×7×7
The LCM will be ...
2×2×2×3×3×3×5×7×7 = 52920
The smallest natural number divisible by 314, 378, and 392 is 52920.