Finding the Third Proportional to 320,134.50 and 699,309

Step by Step Solution

1. Step 1: Write the proportion equation
   320,134.50 : 699,309 = 699,309 : x
2. Step 2: Convert to fraction form
   320,134.50/699,309 = 699,309/x
3. Step 3: Cross multiply
   320,134.50x = 699,309 × 699,309
4. Step 4: Simplify right side
   320,134.50x = 489,033,077,481
5. Step 5: Solve for x
   x = 489,033,077,481/320,134.50
6. Step 6: Final answer
   x = 1,527,586.30