The most widely used languages for companies in the world are Chinese and French, so I strongly recommend that you learn these two. All others are also welcome. Of course you need to search your own business type and find out which languages are necessary. I hope this can help you to make a start with it.
It depends on you business are and interests. You know best what you want to do, where you want to go and which language would be helpful to you.
If you are talking about Europe, I could recommend Spanish, French and German.
Mandarin would be a good choice.
You need to be careful doing business with those Chinese first generation millionaires you know.
Are you just learning it for fun ? How many you have learnt so far ?
It will depend on what your goal is, so until you state the background, it would be difficult to tell you :)
If i will given a chance to learn foreign language i would like to learn Chinese language the purpose for this is that its an impressive language
China is a developing country which has great import and export system in whole world its roots also reach on my Pakistan BY expert in this language i may able to communicate with them and somehow help my country for bringing good relations with them
Also i want to go abroad and settle my business their so i have to learn this language we can reach into hearts of others by our language so in y point of view all languages are important and have specific history but i want to learn Chinese because this language attracts me captivate me in its charm but its not easy for me to do that because i have to learn from nursery of chines which is time consuming and in this busy life time is precious if i ever get chance i will choose this language to be learnt.
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Spanish, mandarin Chinese, Hindi or Latin. Depending on where you want to travel to.