Finding the Third Proportional to 978,664 and 2,149,784

Step by Step Solution

1. Step 1: Write the proportion equation
   978,664 : 2,149,784 = 2,149,784 : x
2. Step 2: Convert to fraction form
   978,664/2,149,784 = 2,149,784/x
3. Step 3: Cross multiply
   978,664x = 2,149,784 × 2,149,784
4. Step 4: Simplify right side
   978,664x = 4,621,571,246,656
5. Step 5: Solve for x
   x = 4,621,571,246,656/978,664
6. Step 6: Final answer
   x = 4,722,326.81