Finding the Third Proportional to 123,912 and 263,808

Step by Step Solution

1. Step 1: Write the proportion equation
   123,912 : 263,808 = 263,808 : x
2. Step 2: Convert to fraction form
   123,912/263,808 = 263,808/x
3. Step 3: Cross multiply
   123,912x = 263,808 × 263,808
4. Step 4: Simplify right side
   123,912x = 69,594,660,864
5. Step 5: Solve for x
   x = 69,594,660,864/123,912
6. Step 6: Final answer
   x = 561,645.85