Finding the Third Proportional to 357,058 and 489,610.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,058 : 489,610.50 = 489,610.50 : x
2. Step 2: Convert to fraction form
   357,058/489,610.50 = 489,610.50/x
3. Step 3: Cross multiply
   357,058x = 489,610.50 × 489,610.50
4. Step 4: Simplify right side
   357,058x = 239,718,441,710.25
5. Step 5: Solve for x
   x = 239,718,441,710.25/357,058
6. Step 6: Final answer
   x = 671,371.15