Finding the Third Proportional to 89,720 and 188,740

Step by Step Solution

1. Step 1: Write the proportion equation
   89,720 : 188,740 = 188,740 : x
2. Step 2: Convert to fraction form
   89,720/188,740 = 188,740/x
3. Step 3: Cross multiply
   89,720x = 188,740 × 188,740
4. Step 4: Simplify right side
   89,720x = 35,622,787,600
5. Step 5: Solve for x
   x = 35,622,787,600/89,720
6. Step 6: Final answer
   x = 397,044.00