Finding the Third Proportional to 9,936,864 and 21,290,256

Step by Step Solution

1. Step 1: Write the proportion equation
   9,936,864 : 21,290,256 = 21,290,256 : x
2. Step 2: Convert to fraction form
   9,936,864/21,290,256 = 21,290,256/x
3. Step 3: Cross multiply
   9,936,864x = 21,290,256 × 21,290,256
4. Step 4: Simplify right side
   9,936,864x = 453,275,000,545,536
5. Step 5: Solve for x
   x = 453,275,000,545,536/9,936,864
6. Step 6: Final answer
   x = 45,615,498.06