Finding the Third Proportional to 10,430,966 and 21,156,715

Step by Step Solution

1. Step 1: Write the proportion equation
   10,430,966 : 21,156,715 = 21,156,715 : x
2. Step 2: Convert to fraction form
   10,430,966/21,156,715 = 21,156,715/x
3. Step 3: Cross multiply
   10,430,966x = 21,156,715 × 21,156,715
4. Step 4: Simplify right side
   10,430,966x = 447,606,589,591,225
5. Step 5: Solve for x
   x = 447,606,589,591,225/10,430,966
6. Step 6: Final answer
   x = 42,911,326.68