Finding the Third Proportional to 9,970,136 and 21,689,872

Step by Step Solution

1. Step 1: Write the proportion equation
   9,970,136 : 21,689,872 = 21,689,872 : x
2. Step 2: Convert to fraction form
   9,970,136/21,689,872 = 21,689,872/x
3. Step 3: Cross multiply
   9,970,136x = 21,689,872 × 21,689,872
4. Step 4: Simplify right side
   9,970,136x = 470,450,547,376,384
5. Step 5: Solve for x
   x = 470,450,547,376,384/9,970,136
6. Step 6: Final answer
   x = 47,185,970.92