At this moment Fortune suddenly appeared to the beggar and said ,"Listen! I have long wished to help you. Here are a lot of gold coins I have found. Hold out your wallet,and I will fill it with them ; but only on this condition: all shall be gold that falls into the wallet,but if any of them falls out of the wallet to the ground, it shall become dust.consider this well. I have warned you I shall strictly keep my word. Your wallet is old ,don't fill it beyond its power. " The beggar was almost too overjoyed to breathe. He hardly felt the ground below his feet . A stream of coins were poured into it .The wallet soon became rather heavy.
我的翻译对吗？ 不对，请订正：
1.consider this well 考虑清楚哦
2.The beggar was almost too overjoyed to breathe 这个乞丐几乎高兴得踹不过气来
3.He hardly felt the ground below his feet .他飘飘然
4.第一句话中的Fortune到底是人还是别的什么？

第1、2句翻译得可以。

3.如果说“飘飘然”，汉语常用意思是（受到表扬后或取得好的成绩后）非常得意，甚至得意忘形。这句话没有这样的意思。
建议接近直译为“几乎站立不稳”或是根据语境翻译为“感觉如此不真实”。

4.不知道你这段话出自哪里，是童话还是想象中的画面？
不管是什么，感觉应该是指“幸运之神”之类的东西。