Finding the Third Proportional to 436,779 and 678,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   436,779 : 678,496.50 = 678,496.50 : x
2. Step 2: Convert to fraction form
   436,779/678,496.50 = 678,496.50/x
3. Step 3: Cross multiply
   436,779x = 678,496.50 × 678,496.50
4. Step 4: Simplify right side
   436,779x = 460,357,500,512.25
5. Step 5: Solve for x
   x = 460,357,500,512.25/436,779
6. Step 6: Final answer
   x = 1,053,982.68