Finding the Third Proportional to 809,866 and 1,778,438

Step by Step Solution

1. Step 1: Write the proportion equation
   809,866 : 1,778,438 = 1,778,438 : x
2. Step 2: Convert to fraction form
   809,866/1,778,438 = 1,778,438/x
3. Step 3: Cross multiply
   809,866x = 1,778,438 × 1,778,438
4. Step 4: Simplify right side
   809,866x = 3,162,841,719,844
5. Step 5: Solve for x
   x = 3,162,841,719,844/809,866
6. Step 6: Final answer
   x = 3,905,388.94