Finding the Third Proportional to 89,721 and 188,739

Step by Step Solution

1. Step 1: Write the proportion equation
   89,721 : 188,739 = 188,739 : x
2. Step 2: Convert to fraction form
   89,721/188,739 = 188,739/x
3. Step 3: Cross multiply
   89,721x = 188,739 × 188,739
4. Step 4: Simplify right side
   89,721x = 35,622,410,121
5. Step 5: Solve for x
   x = 35,622,410,121/89,721
6. Step 6: Final answer
   x = 397,035.37