Finding the Third Proportional to 111,868.50 and 218,067

Step by Step Solution

1. Step 1: Write the proportion equation
   111,868.50 : 218,067 = 218,067 : x
2. Step 2: Convert to fraction form
   111,868.50/218,067 = 218,067/x
3. Step 3: Cross multiply
   111,868.50x = 218,067 × 218,067
4. Step 4: Simplify right side
   111,868.50x = 47,553,216,489
5. Step 5: Solve for x
   x = 47,553,216,489/111,868.50
6. Step 6: Final answer
   x = 425,081.38