Finding the Third Proportional to 21,681,976 and 42,815,600

Step by Step Solution

1. Step 1: Write the proportion equation
   21,681,976 : 42,815,600 = 42,815,600 : x
2. Step 2: Convert to fraction form
   21,681,976/42,815,600 = 42,815,600/x
3. Step 3: Cross multiply
   21,681,976x = 42,815,600 × 42,815,600
4. Step 4: Simplify right side
   21,681,976x = 1,833,175,603,360,000
5. Step 5: Solve for x
   x = 1,833,175,603,360,000/21,681,976
6. Step 6: Final answer
   x = 84,548,364.20