Finding the Third Proportional to 4,485,928 and 9,729,040

Step by Step Solution

1. Step 1: Write the proportion equation
   4,485,928 : 9,729,040 = 9,729,040 : x
2. Step 2: Convert to fraction form
   4,485,928/9,729,040 = 9,729,040/x
3. Step 3: Cross multiply
   4,485,928x = 9,729,040 × 9,729,040
4. Step 4: Simplify right side
   4,485,928x = 94,654,219,321,600
5. Step 5: Solve for x
   x = 94,654,219,321,600/4,485,928
6. Step 6: Final answer
   x = 21,100,253.80