Finding the Third Proportional to 90,728 and 140,828

Step by Step Solution

1. Step 1: Write the proportion equation
   90,728 : 140,828 = 140,828 : x
2. Step 2: Convert to fraction form
   90,728/140,828 = 140,828/x
3. Step 3: Cross multiply
   90,728x = 140,828 × 140,828
4. Step 4: Simplify right side
   90,728x = 19,832,525,584
5. Step 5: Solve for x
   x = 19,832,525,584/90,728
6. Step 6: Final answer
   x = 218,593.22