Finding the Third Proportional to 4,659,556 and 9,966,792

Step by Step Solution

1. Step 1: Write the proportion equation
   4,659,556 : 9,966,792 = 9,966,792 : x
2. Step 2: Convert to fraction form
   4,659,556/9,966,792 = 9,966,792/x
3. Step 3: Cross multiply
   4,659,556x = 9,966,792 × 9,966,792
4. Step 4: Simplify right side
   4,659,556x = 99,336,942,771,264
5. Step 5: Solve for x
   x = 99,336,942,771,264/4,659,556
6. Step 6: Final answer
   x = 21,318,971.76