Finding the Third Proportional to 8,426.69 and 18,438.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,426.69 : 18,438.81 = 18,438.81 : x
2. Step 2: Convert to fraction form
   8,426.69/18,438.81 = 18,438.81/x
3. Step 3: Cross multiply
   8,426.69x = 18,438.81 × 18,438.81
4. Step 4: Simplify right side
   8,426.69x = 339,989,770.40
5. Step 5: Solve for x
   x = 339,989,770.40/8,426.69
6. Step 6: Final answer
   x = 40,346.78