Finding the Third Proportional to 111,618 and 263,434.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,618 : 263,434.50 = 263,434.50 : x
2. Step 2: Convert to fraction form
   111,618/263,434.50 = 263,434.50/x
3. Step 3: Cross multiply
   111,618x = 263,434.50 × 263,434.50
4. Step 4: Simplify right side
   111,618x = 69,397,735,790.25
5. Step 5: Solve for x
   x = 69,397,735,790.25/111,618
6. Step 6: Final answer
   x = 621,743.23