Finding the Third Proportional to 212,840 and 443,707

Step by Step Solution

1. Step 1: Write the proportion equation
   212,840 : 443,707 = 443,707 : x
2. Step 2: Convert to fraction form
   212,840/443,707 = 443,707/x
3. Step 3: Cross multiply
   212,840x = 443,707 × 443,707
4. Step 4: Simplify right side
   212,840x = 196,875,901,849
5. Step 5: Solve for x
   x = 196,875,901,849/212,840
6. Step 6: Final answer
   x = 924,994.84