Finding the Third Proportional to 320,238 and 689,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,238 : 689,959.50 = 689,959.50 : x
2. Step 2: Convert to fraction form
   320,238/689,959.50 = 689,959.50/x
3. Step 3: Cross multiply
   320,238x = 689,959.50 × 689,959.50
4. Step 4: Simplify right side
   320,238x = 476,044,111,640.25
5. Step 5: Solve for x
   x = 476,044,111,640.25/320,238
6. Step 6: Final answer
   x = 1,486,532.24