Finding the Third Proportional to 313,768.50 and 646,116

Step by Step Solution

1. Step 1: Write the proportion equation
   313,768.50 : 646,116 = 646,116 : x
2. Step 2: Convert to fraction form
   313,768.50/646,116 = 646,116/x
3. Step 3: Cross multiply
   313,768.50x = 646,116 × 646,116
4. Step 4: Simplify right side
   313,768.50x = 417,465,885,456
5. Step 5: Solve for x
   x = 417,465,885,456/313,768.50
6. Step 6: Final answer
   x = 1,330,490.11