Finding the Third Proportional to 269,008 and 390,839

Step by Step Solution

1. Step 1: Write the proportion equation
   269,008 : 390,839 = 390,839 : x
2. Step 2: Convert to fraction form
   269,008/390,839 = 390,839/x
3. Step 3: Cross multiply
   269,008x = 390,839 × 390,839
4. Step 4: Simplify right side
   269,008x = 152,755,123,921
5. Step 5: Solve for x
   x = 152,755,123,921/269,008
6. Step 6: Final answer
   x = 567,846.03