Finding the Third Proportional to 317,967 and 691,153.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,967 : 691,153.50 = 691,153.50 : x
2. Step 2: Convert to fraction form
   317,967/691,153.50 = 691,153.50/x
3. Step 3: Cross multiply
   317,967x = 691,153.50 × 691,153.50
4. Step 4: Simplify right side
   317,967x = 477,693,160,562.25
5. Step 5: Solve for x
   x = 477,693,160,562.25/317,967
6. Step 6: Final answer
   x = 1,502,335.65