Finding the Third Proportional to 388,288 and 581,856

Step by Step Solution

1. Step 1: Write the proportion equation
   388,288 : 581,856 = 581,856 : x
2. Step 2: Convert to fraction form
   388,288/581,856 = 581,856/x
3. Step 3: Cross multiply
   388,288x = 581,856 × 581,856
4. Step 4: Simplify right side
   388,288x = 338,556,404,736
5. Step 5: Solve for x
   x = 338,556,404,736/388,288
6. Step 6: Final answer
   x = 871,920.85