Finding the Third Proportional to 448,404 and 666,218

Step by Step Solution

1. Step 1: Write the proportion equation
   448,404 : 666,218 = 666,218 : x
2. Step 2: Convert to fraction form
   448,404/666,218 = 666,218/x
3. Step 3: Cross multiply
   448,404x = 666,218 × 666,218
4. Step 4: Simplify right side
   448,404x = 443,846,423,524
5. Step 5: Solve for x
   x = 443,846,423,524/448,404
6. Step 6: Final answer
   x = 989,836.00