Finding the Third Proportional to 394,588 and 641,076

Step by Step Solution

1. Step 1: Write the proportion equation
   394,588 : 641,076 = 641,076 : x
2. Step 2: Convert to fraction form
   394,588/641,076 = 641,076/x
3. Step 3: Cross multiply
   394,588x = 641,076 × 641,076
4. Step 4: Simplify right side
   394,588x = 410,978,437,776
5. Step 5: Solve for x
   x = 410,978,437,776/394,588
6. Step 6: Final answer
   x = 1,041,538.11