Finding the Third Proportional to 2,145,690 and 4,639,842

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145,690 : 4,639,842 = 4,639,842 : x
2. Step 2: Convert to fraction form
   2,145,690/4,639,842 = 4,639,842/x
3. Step 3: Cross multiply
   2,145,690x = 4,639,842 × 4,639,842
4. Step 4: Simplify right side
   2,145,690x = 21,528,133,784,964
5. Step 5: Solve for x
   x = 21,528,133,784,964/2,145,690
6. Step 6: Final answer
   x = 10,033,198.54