Finding the Third Proportional to 21,681,945 and 42,815,538

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681,945 : 42,815,538 = 42,815,538 : x
2. Step 2: Convert to fraction form
   21,681,945/42,815,538 = 42,815,538/x
3. Step 3: Cross multiply
   21,681,945x = 42,815,538 × 42,815,538
4. Step 4: Simplify right side
   21,681,945x = 1,833,170,294,229,444
5. Step 5: Solve for x
   x = 1,833,170,294,229,444/21,681,945
6. Step 6: Final answer
   x = 84,548,240.22