Finding the Third Proportional to 4,485,912 and 9,729,012

Step by Step Solution

1. Step 1: Write the proportion equation
   4,485,912 : 9,729,012 = 9,729,012 : x
2. Step 2: Convert to fraction form
   4,485,912/9,729,012 = 9,729,012/x
3. Step 3: Cross multiply
   4,485,912x = 9,729,012 × 9,729,012
4. Step 4: Simplify right side
   4,485,912x = 94,653,674,496,144
5. Step 5: Solve for x
   x = 94,653,674,496,144/4,485,912
6. Step 6: Final answer
   x = 21,100,207.60