Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 19998)
+++ wp-includes/formatting.php	(working copy)
@@ -80,6 +80,8 @@
 		}
 		if ( "'" != $opening_single_quote )
 			$dynamic[ '/(\s|\A|[([{<]|")\'/'       ] = '$1' . $opening_single_quote; // opening single quote, even after (, {, <, [
+		if ( '"' != $closing_quote )
+			$dynamic[ '/"(.*\d)"/'                    ] = $opening_quote . '$1' . $closing_quote; // in situations when the quoted text ends with a decimal digit, "like so: 42"
 		if ( '"' != $double_prime )
 			$dynamic[ '/(\d)"/'                    ] = '$1' . $double_prime; // 9" (double prime)
 		if ( "'" != $prime )