Finding the Third Proportional to 357,040 and 489,583.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,040 : 489,583.50 = 489,583.50 : x
2. Step 2: Convert to fraction form
   357,040/489,583.50 = 489,583.50/x
3. Step 3: Cross multiply
   357,040x = 489,583.50 × 489,583.50
4. Step 4: Simplify right side
   357,040x = 239,692,003,472.25
5. Step 5: Solve for x
   x = 239,692,003,472.25/357,040
6. Step 6: Final answer
   x = 671,330.95