Finding the Third Proportional to 4,707,864 and 9,980,688

Step by Step Solution

1. Step 1: Write the proportion equation
   4,707,864 : 9,980,688 = 9,980,688 : x
2. Step 2: Convert to fraction form
   4,707,864/9,980,688 = 9,980,688/x
3. Step 3: Cross multiply
   4,707,864x = 9,980,688 × 9,980,688
4. Step 4: Simplify right side
   4,707,864x = 99,614,132,953,344
5. Step 5: Solve for x
   x = 99,614,132,953,344/4,707,864
6. Step 6: Final answer
   x = 21,159,093.16