Finding the Third Proportional to 408,942 and 838,282.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,942 : 838,282.50 = 838,282.50 : x
2. Step 2: Convert to fraction form
   408,942/838,282.50 = 838,282.50/x
3. Step 3: Cross multiply
   408,942x = 838,282.50 × 838,282.50
4. Step 4: Simplify right side
   408,942x = 702,717,549,806.25
5. Step 5: Solve for x
   x = 702,717,549,806.25/408,942
6. Step 6: Final answer
   x = 1,718,379.50