A helium-filled balloon is attached to a long string and is at a height of 78 m from the ground. The string is tied to a hook on the ground and makes an angle of 30° with the ground, as shown below. The figure shows a right angle triangle with a balloon at the tip of the triangle. The string attached to the balloon makes an angle of 30 degrees to the ground. The height of the balloon from the ground is 78 meters. What is the length of the string, in meters?