Finding the Third Proportional to 448,476 and 666,320

Step by Step Solution

1. Step 1: Write the proportion equation
   448,476 : 666,320 = 666,320 : x
2. Step 2: Convert to fraction form
   448,476/666,320 = 666,320/x
3. Step 3: Cross multiply
   448,476x = 666,320 × 666,320
4. Step 4: Simplify right side
   448,476x = 443,982,342,400
5. Step 5: Solve for x
   x = 443,982,342,400/448,476
6. Step 6: Final answer
   x = 989,980.16