Finding the Third Proportional to 21,681,982 and 42,815,612

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681,982 : 42,815,612 = 42,815,612 : x
2. Step 2: Convert to fraction form
   21,681,982/42,815,612 = 42,815,612/x
3. Step 3: Cross multiply
   21,681,982x = 42,815,612 × 42,815,612
4. Step 4: Simplify right side
   21,681,982x = 1,833,176,630,934,544
5. Step 5: Solve for x
   x = 1,833,176,630,934,544/21,681,982
6. Step 6: Final answer
   x = 84,548,388.19