Finding the Third Proportional to 12,960 and 30,960

Step by Step Solution

1. Step 1: Write the proportion equation
   12,960 : 30,960 = 30,960 : x
2. Step 2: Convert to fraction form
   12,960/30,960 = 30,960/x
3. Step 3: Cross multiply
   12,960x = 30,960 × 30,960
4. Step 4: Simplify right side
   12,960x = 958,521,600
5. Step 5: Solve for x
   x = 958,521,600/12,960
6. Step 6: Final answer
   x = 73,960