Finding the Third Proportional to 354,436.50 and 777,766.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,436.50 : 777,766.50 = 777,766.50 : x
2. Step 2: Convert to fraction form
   354,436.50/777,766.50 = 777,766.50/x
3. Step 3: Cross multiply
   354,436.50x = 777,766.50 × 777,766.50
4. Step 4: Simplify right side
   354,436.50x = 604,920,728,522.25
5. Step 5: Solve for x
   x = 604,920,728,522.25/354,436.50
6. Step 6: Final answer
   x = 1,706,711.16