Finding the Third Proportional to 318,133 and 686,081.25

Step by Step Solution

1. Step 1: Write the proportion equation
   318,133 : 686,081.25 = 686,081.25 : x
2. Step 2: Convert to fraction form
   318,133/686,081.25 = 686,081.25/x
3. Step 3: Cross multiply
   318,133x = 686,081.25 × 686,081.25
4. Step 4: Simplify right side
   318,133x = 470,707,481,601.56
5. Step 5: Solve for x
   x = 470,707,481,601.56/318,133
6. Step 6: Final answer
   x = 1,479,593.38