Finding the Third Proportional to 81,272 and 107,870

Step by Step Solution

1. Step 1: Write the proportion equation
   81,272 : 107,870 = 107,870 : x
2. Step 2: Convert to fraction form
   81,272/107,870 = 107,870/x
3. Step 3: Cross multiply
   81,272x = 107,870 × 107,870
4. Step 4: Simplify right side
   81,272x = 11,635,936,900
5. Step 5: Solve for x
   x = 11,635,936,900/81,272
6. Step 6: Final answer
   x = 143,172.76