Finding the Third Proportional to 90,992 and 139,386

Step by Step Solution

1. Step 1: Write the proportion equation
   90,992 : 139,386 = 139,386 : x
2. Step 2: Convert to fraction form
   90,992/139,386 = 139,386/x
3. Step 3: Cross multiply
   90,992x = 139,386 × 139,386
4. Step 4: Simplify right side
   90,992x = 19,428,456,996
5. Step 5: Solve for x
   x = 19,428,456,996/90,992
6. Step 6: Final answer
   x = 213,518.30