Finding the Third Proportional to 138,781.69 and 288,469.69

Step by Step Solution

1. Step 1: Write the proportion equation
   138,781.69 : 288,469.69 = 288,469.69 : x
2. Step 2: Convert to fraction form
   138,781.69/288,469.69 = 288,469.69/x
3. Step 3: Cross multiply
   138,781.69x = 288,469.69 × 288,469.69
4. Step 4: Simplify right side
   138,781.69x = 83,214,760,606.35
5. Step 5: Solve for x
   x = 83,214,760,606.35/138,781.69
6. Step 6: Final answer
   x = 599,609.08