Finding the Third Proportional to 300,060 and 640,296

Step by Step Solution

1. Step 1: Write the proportion equation
   300,060 : 640,296 = 640,296 : x
2. Step 2: Convert to fraction form
   300,060/640,296 = 640,296/x
3. Step 3: Cross multiply
   300,060x = 640,296 × 640,296
4. Step 4: Simplify right side
   300,060x = 409,978,967,616
5. Step 5: Solve for x
   x = 409,978,967,616/300,060
6. Step 6: Final answer
   x = 1,366,323.29