Finding the Third Proportional to 316,640 and 666,082

Step by Step Solution

1. Step 1: Write the proportion equation
   316,640 : 666,082 = 666,082 : x
2. Step 2: Convert to fraction form
   316,640/666,082 = 666,082/x
3. Step 3: Cross multiply
   316,640x = 666,082 × 666,082
4. Step 4: Simplify right side
   316,640x = 443,665,230,724
5. Step 5: Solve for x
   x = 443,665,230,724/316,640
6. Step 6: Final answer
   x = 1,401,166.09