Finding the Third Proportional to 145,666.50 and 317,811

Step by Step Solution

1. Step 1: Write the proportion equation
   145,666.50 : 317,811 = 317,811 : x
2. Step 2: Convert to fraction form
   145,666.50/317,811 = 317,811/x
3. Step 3: Cross multiply
   145,666.50x = 317,811 × 317,811
4. Step 4: Simplify right side
   145,666.50x = 101,003,831,721
5. Step 5: Solve for x
   x = 101,003,831,721/145,666.50
6. Step 6: Final answer
   x = 693,390.94