Finding the Third Proportional to 7,663,430 and 12,771,872

Step by Step Solution

1. Step 1: Write the proportion equation
   7,663,430 : 12,771,872 = 12,771,872 : x
2. Step 2: Convert to fraction form
   7,663,430/12,771,872 = 12,771,872/x
3. Step 3: Cross multiply
   7,663,430x = 12,771,872 × 12,771,872
4. Step 4: Simplify right side
   7,663,430x = 163,120,714,384,384
5. Step 5: Solve for x
   x = 163,120,714,384,384/7,663,430
6. Step 6: Final answer
   x = 21,285,601.15