Finding the Third Proportional to 448,397 and 666,210

Step by Step Solution

1. Step 1: Write the proportion equation
   448,397 : 666,210 = 666,210 : x
2. Step 2: Convert to fraction form
   448,397/666,210 = 666,210/x
3. Step 3: Cross multiply
   448,397x = 666,210 × 666,210
4. Step 4: Simplify right side
   448,397x = 443,835,764,100
5. Step 5: Solve for x
   x = 443,835,764,100/448,397
6. Step 6: Final answer
   x = 989,827.68