Finding the Third Proportional to 90,996 and 139,393

Step by Step Solution

1. Step 1: Write the proportion equation
   90,996 : 139,393 = 139,393 : x
2. Step 2: Convert to fraction form
   90,996/139,393 = 139,393/x
3. Step 3: Cross multiply
   90,996x = 139,393 × 139,393
4. Step 4: Simplify right side
   90,996x = 19,430,408,449
5. Step 5: Solve for x
   x = 19,430,408,449/90,996
6. Step 6: Final answer
   x = 213,530.36