Finding the Third Proportional to 9,212,507,853 and 19,892,988,642

Step by Step Solution

1. Step 1: Write the proportion equation
   9,212,507,853 : 19,892,988,642 = 19,892,988,642 : x
2. Step 2: Convert to fraction form
   9,212,507,853/19,892,988,642 = 19,892,988,642/x
3. Step 3: Cross multiply
   9,212,507,853x = 19,892,988,642 × 19,892,988,642
4. Step 4: Simplify right side
   9,212,507,853x = 395,730,997,110,741,008,384
5. Step 5: Solve for x
   x = 395,730,997,110,741,008,384/9,212,507,853
6. Step 6: Final answer
   x = 42,955,838,239.19