Finding the Third Proportional to 39,979 and 86,870

Step by Step Solution

1. Step 1: Write the proportion equation
   39,979 : 86,870 = 86,870 : x
2. Step 2: Convert to fraction form
   39,979/86,870 = 86,870/x
3. Step 3: Cross multiply
   39,979x = 86,870 × 86,870
4. Step 4: Simplify right side
   39,979x = 7,546,396,900
5. Step 5: Solve for x
   x = 7,546,396,900/39,979
6. Step 6: Final answer
   x = 188,759.02