Finding the Third Proportional to 1,391,679 and 2,154,857

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391,679 : 2,154,857 = 2,154,857 : x
2. Step 2: Convert to fraction form
   1,391,679/2,154,857 = 2,154,857/x
3. Step 3: Cross multiply
   1,391,679x = 2,154,857 × 2,154,857
4. Step 4: Simplify right side
   1,391,679x = 4,643,408,690,449
5. Step 5: Solve for x
   x = 4,643,408,690,449/1,391,679
6. Step 6: Final answer
   x = 3,336,551.53