Finding the Third Proportional to 90,778 and 139,995

Step by Step Solution

1. Step 1: Write the proportion equation
   90,778 : 139,995 = 139,995 : x
2. Step 2: Convert to fraction form
   90,778/139,995 = 139,995/x
3. Step 3: Cross multiply
   90,778x = 139,995 × 139,995
4. Step 4: Simplify right side
   90,778x = 19,598,600,025
5. Step 5: Solve for x
   x = 19,598,600,025/90,778
6. Step 6: Final answer
   x = 215,895.92