Finding the Third Proportional to 12,872 and 30,980

Step by Step Solution

1. Step 1: Write the proportion equation
   12,872 : 30,980 = 30,980 : x
2. Step 2: Convert to fraction form
   12,872/30,980 = 30,980/x
3. Step 3: Cross multiply
   12,872x = 30,980 × 30,980
4. Step 4: Simplify right side
   12,872x = 959,760,400
5. Step 5: Solve for x
   x = 959,760,400/12,872
6. Step 6: Final answer
   x = 74,561.87