Finding the Third Proportional to 439,974 and 680,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,974 : 680,143.50 = 680,143.50 : x
2. Step 2: Convert to fraction form
   439,974/680,143.50 = 680,143.50/x
3. Step 3: Cross multiply
   439,974x = 680,143.50 × 680,143.50
4. Step 4: Simplify right side
   439,974x = 462,595,180,592.25
5. Step 5: Solve for x
   x = 462,595,180,592.25/439,974
6. Step 6: Final answer
   x = 1,051,414.81