Finding the Third Proportional to 81,980 and 123,720

Step by Step Solution

1. Step 1: Write the proportion equation
   81,980 : 123,720 = 123,720 : x
2. Step 2: Convert to fraction form
   81,980/123,720 = 123,720/x
3. Step 3: Cross multiply
   81,980x = 123,720 × 123,720
4. Step 4: Simplify right side
   81,980x = 15,306,638,400
5. Step 5: Solve for x
   x = 15,306,638,400/81,980
6. Step 6: Final answer
   x = 186,711.86