Finding the Third Proportional to 8,724,738 and 18,636,978

Step by Step Solution

1. Step 1: Write the proportion equation
   8,724,738 : 18,636,978 = 18,636,978 : x
2. Step 2: Convert to fraction form
   8,724,738/18,636,978 = 18,636,978/x
3. Step 3: Cross multiply
   8,724,738x = 18,636,978 × 18,636,978
4. Step 4: Simplify right side
   8,724,738x = 347,336,948,972,484
5. Step 5: Solve for x
   x = 347,336,948,972,484/8,724,738
6. Step 6: Final answer
   x = 39,810,587.89