Finding the Third Proportional to 448,402 and 666,215

Step by Step Solution

1. Step 1: Write the proportion equation
   448,402 : 666,215 = 666,215 : x
2. Step 2: Convert to fraction form
   448,402/666,215 = 666,215/x
3. Step 3: Cross multiply
   448,402x = 666,215 × 666,215
4. Step 4: Simplify right side
   448,402x = 443,842,426,225
5. Step 5: Solve for x
   x = 443,842,426,225/448,402
6. Step 6: Final answer
   x = 989,831.50