Finding the Third Proportional to 2,489,430 and 5,460,780

Step by Step Solution

1. Step 1: Write the proportion equation
   2,489,430 : 5,460,780 = 5,460,780 : x
2. Step 2: Convert to fraction form
   2,489,430/5,460,780 = 5,460,780/x
3. Step 3: Cross multiply
   2,489,430x = 5,460,780 × 5,460,780
4. Step 4: Simplify right side
   2,489,430x = 29,820,118,208,400
5. Step 5: Solve for x
   x = 29,820,118,208,400/2,489,430
6. Step 6: Final answer
   x = 11,978,693.20