Finding the Third Proportional to 448,398 and 666,209.25

Step by Step Solution

1. Step 1: Write the proportion equation
   448,398 : 666,209.25 = 666,209.25 : x
2. Step 2: Convert to fraction form
   448,398/666,209.25 = 666,209.25/x
3. Step 3: Cross multiply
   448,398x = 666,209.25 × 666,209.25
4. Step 4: Simplify right side
   448,398x = 443,834,764,785.56
5. Step 5: Solve for x
   x = 443,834,764,785.56/448,398
6. Step 6: Final answer
   x = 989,823.25