Finding the Third Proportional to 4,640,664 and 9,966,834

Step by Step Solution

1. Step 1: Write the proportion equation
   4,640,664 : 9,966,834 = 9,966,834 : x
2. Step 2: Convert to fraction form
   4,640,664/9,966,834 = 9,966,834/x
3. Step 3: Cross multiply
   4,640,664x = 9,966,834 × 9,966,834
4. Step 4: Simplify right side
   4,640,664x = 99,337,779,983,556
5. Step 5: Solve for x
   x = 99,337,779,983,556/4,640,664
6. Step 6: Final answer
   x = 21,405,941.04