Finding the Third Proportional to 408,118.50 and 878,809.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,118.50 : 878,809.50 = 878,809.50 : x
2. Step 2: Convert to fraction form
   408,118.50/878,809.50 = 878,809.50/x
3. Step 3: Cross multiply
   408,118.50x = 878,809.50 × 878,809.50
4. Step 4: Simplify right side
   408,118.50x = 772,306,137,290.25
5. Step 5: Solve for x
   x = 772,306,137,290.25/408,118.50
6. Step 6: Final answer
   x = 1,892,357.58