Finding the Third Proportional to 111,709 and 239,410

Step by Step Solution

1. Step 1: Write the proportion equation
   111,709 : 239,410 = 239,410 : x
2. Step 2: Convert to fraction form
   111,709/239,410 = 239,410/x
3. Step 3: Cross multiply
   111,709x = 239,410 × 239,410
4. Step 4: Simplify right side
   111,709x = 57,317,148,100
5. Step 5: Solve for x
   x = 57,317,148,100/111,709
6. Step 6: Final answer
   x = 513,093.38