Finding the Third Proportional to 21,685,984 and 28,910,672

Step by Step Solution

1. Step 1: Write the proportion equation
   21,685,984 : 28,910,672 = 28,910,672 : x
2. Step 2: Convert to fraction form
   21,685,984/28,910,672 = 28,910,672/x
3. Step 3: Cross multiply
   21,685,984x = 28,910,672 × 28,910,672
4. Step 4: Simplify right side
   21,685,984x = 835,826,955,491,584
5. Step 5: Solve for x
   x = 835,826,955,491,584/21,685,984
6. Step 6: Final answer
   x = 38,542,265.62