Finding the Third Proportional to 21,692,638 and 28,789,345

Step by Step Solution

1. Step 1: Write the proportion equation
   21,692,638 : 28,789,345 = 28,789,345 : x
2. Step 2: Convert to fraction form
   21,692,638/28,789,345 = 28,789,345/x
3. Step 3: Cross multiply
   21,692,638x = 28,789,345 × 28,789,345
4. Step 4: Simplify right side
   21,692,638x = 828,826,385,529,025
5. Step 5: Solve for x
   x = 828,826,385,529,025/21,692,638
6. Step 6: Final answer
   x = 38,207,726.77