Finding the Third Proportional to 221,870 and 485,212

Step by Step Solution

1. Step 1: Write the proportion equation
   221,870 : 485,212 = 485,212 : x
2. Step 2: Convert to fraction form
   221,870/485,212 = 485,212/x
3. Step 3: Cross multiply
   221,870x = 485,212 × 485,212
4. Step 4: Simplify right side
   221,870x = 235,430,684,944
5. Step 5: Solve for x
   x = 235,430,684,944/221,870
6. Step 6: Final answer
   x = 1,061,119.96