Finding the Third Proportional to 21,681,972 and 42,815,592

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681,972 : 42,815,592 = 42,815,592 : x
2. Step 2: Convert to fraction form
   21,681,972/42,815,592 = 42,815,592/x
3. Step 3: Cross multiply
   21,681,972x = 42,815,592 × 42,815,592
4. Step 4: Simplify right side
   21,681,972x = 1,833,174,918,310,464
5. Step 5: Solve for x
   x = 1,833,174,918,310,464/21,681,972
6. Step 6: Final answer
   x = 84,548,348.20