Finding the Third Proportional to 90,860 and 212,230

Step by Step Solution

1. Step 1: Write the proportion equation
   90,860 : 212,230 = 212,230 : x
2. Step 2: Convert to fraction form
   90,860/212,230 = 212,230/x
3. Step 3: Cross multiply
   90,860x = 212,230 × 212,230
4. Step 4: Simplify right side
   90,860x = 45,041,572,900
5. Step 5: Solve for x
   x = 45,041,572,900/90,860
6. Step 6: Final answer
   x = 495,724.99