Finding the Third Proportional to 414,875.75 and 640,736

Step by Step Solution

1. Step 1: Write the proportion equation
   414,875.75 : 640,736 = 640,736 : x
2. Step 2: Convert to fraction form
   414,875.75/640,736 = 640,736/x
3. Step 3: Cross multiply
   414,875.75x = 640,736 × 640,736
4. Step 4: Simplify right side
   414,875.75x = 410,542,621,696
5. Step 5: Solve for x
   x = 410,542,621,696/414,875.75
6. Step 6: Final answer
   x = 989,555.60