Instacart posted disappointing fourth-quarter revenue and projected lower-than-expected adjusted earnings in the current period, offering a mixed picture about its business even as delivery orders remained robust.Sales from delivery transactions for the last three months of 2024 were $616 million, the company said in a shareholder letter Tuesday, falling short of the average analyst estimate of $623.4 million, according to Bloomberg-compiled data. Total revenue came to $883 million, also missing...