Finding the Third Proportional to 9,945,264 and 21,420,821

Step by Step Solution

1. Step 1: Write the proportion equation
   9,945,264 : 21,420,821 = 21,420,821 : x
2. Step 2: Convert to fraction form
   9,945,264/21,420,821 = 21,420,821/x
3. Step 3: Cross multiply
   9,945,264x = 21,420,821 × 21,420,821
4. Step 4: Simplify right side
   9,945,264x = 458,851,572,314,041
5. Step 5: Solve for x
   x = 458,851,572,314,041/9,945,264
6. Step 6: Final answer
   x = 46,137,696.53