Finding the Third Proportional to 389,142 and 591,687

Step by Step Solution

1. Step 1: Write the proportion equation
   389,142 : 591,687 = 591,687 : x
2. Step 2: Convert to fraction form
   389,142/591,687 = 591,687/x
3. Step 3: Cross multiply
   389,142x = 591,687 × 591,687
4. Step 4: Simplify right side
   389,142x = 350,093,505,969
5. Step 5: Solve for x
   x = 350,093,505,969/389,142
6. Step 6: Final answer
   x = 899,654.90