The original Hebrew word in this passage is "shalom".
The NIV is the only translation that reads,"prosper".
Although prosperity is a derivative of the word shalom, it's fairly down on the list. In this particular scripture "peace" is the translated context.
Do I hope that God's plans for me, for my husband, for Nate and my family include prosperity?
But my true joy is found in the peace that God has planned for me and the ones I love.
I desire peace for Nate more than prosperity, more than anything except his salvation.