Finding the Third Proportional to 1,686,378 and 3,980,793

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686,378 : 3,980,793 = 3,980,793 : x
2. Step 2: Convert to fraction form
   1,686,378/3,980,793 = 3,980,793/x
3. Step 3: Cross multiply
   1,686,378x = 3,980,793 × 3,980,793
4. Step 4: Simplify right side
   1,686,378x = 15,846,712,908,849
5. Step 5: Solve for x
   x = 15,846,712,908,849/1,686,378
6. Step 6: Final answer
   x = 9,396,892.58