Finding the Third Proportional to 320,086.50 and 699,231

Step by Step Solution

1. Step 1: Write the proportion equation
   320,086.50 : 699,231 = 699,231 : x
2. Step 2: Convert to fraction form
   320,086.50/699,231 = 699,231/x
3. Step 3: Cross multiply
   320,086.50x = 699,231 × 699,231
4. Step 4: Simplify right side
   320,086.50x = 488,923,991,361
5. Step 5: Solve for x
   x = 488,923,991,361/320,086.50
6. Step 6: Final answer
   x = 1,527,474.58