Finding the Third Proportional to 90,620 and 213,212

Step by Step Solution

1. Step 1: Write the proportion equation
   90,620 : 213,212 = 213,212 : x
2. Step 2: Convert to fraction form
   90,620/213,212 = 213,212/x
3. Step 3: Cross multiply
   90,620x = 213,212 × 213,212
4. Step 4: Simplify right side
   90,620x = 45,459,356,944
5. Step 5: Solve for x
   x = 45,459,356,944/90,620
6. Step 6: Final answer
   x = 501,648.17