Finding the Third Proportional to 354,670.50 and 778,245

Step by Step Solution

1. Step 1: Write the proportion equation
   354,670.50 : 778,245 = 778,245 : x
2. Step 2: Convert to fraction form
   354,670.50/778,245 = 778,245/x
3. Step 3: Cross multiply
   354,670.50x = 778,245 × 778,245
4. Step 4: Simplify right side
   354,670.50x = 605,665,280,025
5. Step 5: Solve for x
   x = 605,665,280,025/354,670.50
6. Step 6: Final answer
   x = 1,707,684.40