Finding the Third Proportional to 389,450 and 808,492

Step by Step Solution

1. Step 1: Write the proportion equation
   389,450 : 808,492 = 808,492 : x
2. Step 2: Convert to fraction form
   389,450/808,492 = 808,492/x
3. Step 3: Cross multiply
   389,450x = 808,492 × 808,492
4. Step 4: Simplify right side
   389,450x = 653,659,314,064
5. Step 5: Solve for x
   x = 653,659,314,064/389,450
6. Step 6: Final answer
   x = 1,678,416.52