Finding the Third Proportional to 354,869 and 778,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,869 : 778,442.50 = 778,442.50 : x
2. Step 2: Convert to fraction form
   354,869/778,442.50 = 778,442.50/x
3. Step 3: Cross multiply
   354,869x = 778,442.50 × 778,442.50
4. Step 4: Simplify right side
   354,869x = 605,972,725,806.25
5. Step 5: Solve for x
   x = 605,972,725,806.25/354,869
6. Step 6: Final answer
   x = 1,707,595.55