Finding the Third Proportional to 309,381,012 and 447,418,890

Step by Step Solution

1. Step 1: Write the proportion equation
   309,381,012 : 447,418,890 = 447,418,890 : x
2. Step 2: Convert to fraction form
   309,381,012/447,418,890 = 447,418,890/x
3. Step 3: Cross multiply
   309,381,012x = 447,418,890 × 447,418,890
4. Step 4: Simplify right side
   309,381,012x = 200,183,663,128,832,096
5. Step 5: Solve for x
   x = 200,183,663,128,832,096/309,381,012
6. Step 6: Final answer
   x = 647,045,731.20