Finding the Third Proportional to 300,160 and 640,488

Step by Step Solution

1. Step 1: Write the proportion equation
   300,160 : 640,488 = 640,488 : x
2. Step 2: Convert to fraction form
   300,160/640,488 = 640,488/x
3. Step 3: Cross multiply
   300,160x = 640,488 × 640,488
4. Step 4: Simplify right side
   300,160x = 410,224,878,144
5. Step 5: Solve for x
   x = 410,224,878,144/300,160
6. Step 6: Final answer
   x = 1,366,687.36