Finding the Third Proportional to 111,699 and 239,166

Step by Step Solution

1. Step 1: Write the proportion equation
   111,699 : 239,166 = 239,166 : x
2. Step 2: Convert to fraction form
   111,699/239,166 = 239,166/x
3. Step 3: Cross multiply
   111,699x = 239,166 × 239,166
4. Step 4: Simplify right side
   111,699x = 57,200,375,556
5. Step 5: Solve for x
   x = 57,200,375,556/111,699
6. Step 6: Final answer
   x = 512,093.89