Finding the Third Proportional to 21,681,980 and 42,815,608

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681,980 : 42,815,608 = 42,815,608 : x
2. Step 2: Convert to fraction form
   21,681,980/42,815,608 = 42,815,608/x
3. Step 3: Cross multiply
   21,681,980x = 42,815,608 × 42,815,608
4. Step 4: Simplify right side
   21,681,980x = 1,833,176,288,409,664
5. Step 5: Solve for x
   x = 1,833,176,288,409,664/21,681,980
6. Step 6: Final answer
   x = 84,548,380.19