Finding the Third Proportional to 19,644 and 42,399.75

Step by Step Solution

1. Step 1: Write the proportion equation
   19,644 : 42,399.75 = 42,399.75 : x
2. Step 2: Convert to fraction form
   19,644/42,399.75 = 42,399.75/x
3. Step 3: Cross multiply
   19,644x = 42,399.75 × 42,399.75
4. Step 4: Simplify right side
   19,644x = 1,797,738,800.06
5. Step 5: Solve for x
   x = 1,797,738,800.06/19,644
6. Step 6: Final answer
   x = 91,515.92