Finding the Third Proportional to 388,124 and 617,180

Step by Step Solution

1. Step 1: Write the proportion equation
   388,124 : 617,180 = 617,180 : x
2. Step 2: Convert to fraction form
   388,124/617,180 = 617,180/x
3. Step 3: Cross multiply
   388,124x = 617,180 × 617,180
4. Step 4: Simplify right side
   388,124x = 380,911,152,400
5. Step 5: Solve for x
   x = 380,911,152,400/388,124
6. Step 6: Final answer
   x = 981,416.13