How to make the player rotate to where an object is being thrown?

I am making a third person game and the player is allowed to pick up and throw a ball. the problem is that when you rotate the camera and cross hair in front or beside the player, the ball goes in the direction but the player does not rotate.
Here is my script
using UnityEngine;
using System.Collections;

public class throwx : MonoBehaviour {

	public Rigidbody rb;
	public Transform t_Camera; // Drag&Drop your camera over here from the inspector.
	private Vector3 v3_Force; // Force reference vector.
	public float f_Multiplier; // A multiplier value if the force wouldn't be enough.
	public GameObject carryact;
	public Transform ball;

		// Use this for initialization
		void Start ()


	// Update is called once per frame
	void Update ()
		if (Time.deltaTime == 0f)

			if (Input.GetMouseButtonDown(0))
				v3_Force = t_Camera.forward;
				ball.GetComponent<Rigidbody>().AddForce(v3_Force * f_Multiplier, ForceMode.Force);


use transform.lookat(vector3 ballposition, vector3.up)


Example for your Question:

Vector3 targetPostition = new Vector3(ball.position.x, transform.position.y, ball.position.z);