Finding the Third Proportional to 1,289,144 and 2,809,378

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289,144 : 2,809,378 = 2,809,378 : x
2. Step 2: Convert to fraction form
   1,289,144/2,809,378 = 2,809,378/x
3. Step 3: Cross multiply
   1,289,144x = 2,809,378 × 2,809,378
4. Step 4: Simplify right side
   1,289,144x = 7,892,604,746,884
5. Step 5: Solve for x
   x = 7,892,604,746,884/1,289,144
6. Step 6: Final answer
   x = 6,122,360.84