Maybe with SQL, but I wouldnt suggest it, so you have two options:
Query a full list, and then check your condition on each post retrieved.
or
Save the product of those three fields in another meta field, which can then be queried.
EDIT:
For the second method, it really depends on the context.
if you are handling the saving via wp_insert_post, then you can save this extra meta field via update_post_meta.
if you are not handling the saving on the server, you can hook to the saving via save_post hook, and then use get_post_meta to retrieve the values of each field, and then update_post_meta to save the product on a field of your choice, for example
add_action( 'save_post', 'add_product_meta' ); //triggers for every post saved
function add_product_meta ( $post_id )
{
$value1 = get_post_meta( $post_id, 'value1_key', true );
$value2 = get_post_meta( $post_id, 'value2_key', true );
$value3 = get_post_meta( $post_id, 'value3_key', true );
$product = $value1 * $value2 * $value3;
update_post_meta( $prod_id, 'product_of_values', $product );
//use 'product_of_values' as your meta_key for the query
}