Finding the Third Proportional to 354,639 and 769,351.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,639 : 769,351.50 = 769,351.50 : x
2. Step 2: Convert to fraction form
   354,639/769,351.50 = 769,351.50/x
3. Step 3: Cross multiply
   354,639x = 769,351.50 × 769,351.50
4. Step 4: Simplify right side
   354,639x = 591,901,730,552.25
5. Step 5: Solve for x
   x = 591,901,730,552.25/354,639
6. Step 6: Final answer
   x = 1,669,026.05