Finding the Third Proportional to 439,219 and 642,073.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,219 : 642,073.50 = 642,073.50 : x
2. Step 2: Convert to fraction form
   439,219/642,073.50 = 642,073.50/x
3. Step 3: Cross multiply
   439,219x = 642,073.50 × 642,073.50
4. Step 4: Simplify right side
   439,219x = 412,258,379,402.25
5. Step 5: Solve for x
   x = 412,258,379,402.25/439,219
6. Step 6: Final answer
   x = 938,616.91