Finding the Third Proportional to 90,892 and 139,512

Step by Step Solution

1. Step 1: Write the proportion equation
   90,892 : 139,512 = 139,512 : x
2. Step 2: Convert to fraction form
   90,892/139,512 = 139,512/x
3. Step 3: Cross multiply
   90,892x = 139,512 × 139,512
4. Step 4: Simplify right side
   90,892x = 19,463,598,144
5. Step 5: Solve for x
   x = 19,463,598,144/90,892
6. Step 6: Final answer
   x = 214,139.84