Is it permissible to perform sujood al-shukr (prostration of gratitude) for the fulfillment of a need for a Christian colleague?

It appears that the prostration of thankfulness (sujud al-shukr) is not legislated when a blessing occurs to someone else, except for the one who is encompassed by the blessing, or for Muslims in general, or for the repulsion of an apparent tribulation from them. The prostration of thankfulness is sunnah when an apparent blessing is renewed or an apparent affliction is repelled, whether the blessing or affliction is specific to the Muslim or general to all Muslims. Scholars have not mentioned its legislation when a blessing occurs to someone other than one's child.

The wisdom behind prostration is to thank Allah, to submit to Him, and to avert insolence (batar), and this does not occur for your colleague when you prostrate. However, it is legislated for you to rejoice at your colleague's joy, to congratulate him, and to treat him well, for we are commanded to treat people with kindness, as Allah Almighty says: "and speak to people good words." Kindness to your colleague can be by congratulating him, comforting him, helping him, and treating him well.