Finding the Third Proportional to 439,947 and 686,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,947 : 686,212.50 = 686,212.50 : x
2. Step 2: Convert to fraction form
   439,947/686,212.50 = 686,212.50/x
3. Step 3: Cross multiply
   439,947x = 686,212.50 × 686,212.50
4. Step 4: Simplify right side
   439,947x = 470,887,595,156.25
5. Step 5: Solve for x
   x = 470,887,595,156.25/439,947
6. Step 6: Final answer
   x = 1,070,328.01