Finding the Third Proportional to 147,086.50 and 317,499

Step by Step Solution

1. Step 1: Write the proportion equation
   147,086.50 : 317,499 = 317,499 : x
2. Step 2: Convert to fraction form
   147,086.50/317,499 = 317,499/x
3. Step 3: Cross multiply
   147,086.50x = 317,499 × 317,499
4. Step 4: Simplify right side
   147,086.50x = 100,805,615,001
5. Step 5: Solve for x
   x = 100,805,615,001/147,086.50
6. Step 6: Final answer
   x = 685,349.20