Finding the Third Proportional to 10,430,949.75 and 21,156,678

Step by Step Solution

1. Step 1: Write the proportion equation
   10,430,949.75 : 21,156,678 = 21,156,678 : x
2. Step 2: Convert to fraction form
   10,430,949.75/21,156,678 = 21,156,678/x
3. Step 3: Cross multiply
   10,430,949.75x = 21,156,678 × 21,156,678
4. Step 4: Simplify right side
   10,430,949.75x = 447,605,023,995,684
5. Step 5: Solve for x
   x = 447,605,023,995,684/10,430,949.75
6. Step 6: Final answer
   x = 42,911,243.44