Finding the Third Proportional to 317,536.50 and 686,265

Step by Step Solution

1. Step 1: Write the proportion equation
   317,536.50 : 686,265 = 686,265 : x
2. Step 2: Convert to fraction form
   317,536.50/686,265 = 686,265/x
3. Step 3: Cross multiply
   317,536.50x = 686,265 × 686,265
4. Step 4: Simplify right side
   317,536.50x = 470,959,650,225
5. Step 5: Solve for x
   x = 470,959,650,225/317,536.50
6. Step 6: Final answer
   x = 1,483,166.98