Finding the Third Proportional to 1,378,860 and 2,979,120

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378,860 : 2,979,120 = 2,979,120 : x
2. Step 2: Convert to fraction form
   1,378,860/2,979,120 = 2,979,120/x
3. Step 3: Cross multiply
   1,378,860x = 2,979,120 × 2,979,120
4. Step 4: Simplify right side
   1,378,860x = 8,875,155,974,400
5. Step 5: Solve for x
   x = 8,875,155,974,400/1,378,860
6. Step 6: Final answer
   x = 6,436,589.63