Finding the Third Proportional to 300,875 and 640,738

Step by Step Solution

1. Step 1: Write the proportion equation
   300,875 : 640,738 = 640,738 : x
2. Step 2: Convert to fraction form
   300,875/640,738 = 640,738/x
3. Step 3: Cross multiply
   300,875x = 640,738 × 640,738
4. Step 4: Simplify right side
   300,875x = 410,545,184,644
5. Step 5: Solve for x
   x = 410,545,184,644/300,875
6. Step 6: Final answer
   x = 1,364,504.15