Finding the Third Proportional to 9,121,907 and 19,831,540

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121,907 : 19,831,540 = 19,831,540 : x
2. Step 2: Convert to fraction form
   9,121,907/19,831,540 = 19,831,540/x
3. Step 3: Cross multiply
   9,121,907x = 19,831,540 × 19,831,540
4. Step 4: Simplify right side
   9,121,907x = 393,289,978,771,600
5. Step 5: Solve for x
   x = 393,289,978,771,600/9,121,907
6. Step 6: Final answer
   x = 43,114,885.82