Finding the Third Proportional to 357,069 and 489,622.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,069 : 489,622.50 = 489,622.50 : x
2. Step 2: Convert to fraction form
   357,069/489,622.50 = 489,622.50/x
3. Step 3: Cross multiply
   357,069x = 489,622.50 × 489,622.50
4. Step 4: Simplify right side
   357,069x = 239,730,192,506.25
5. Step 5: Solve for x
   x = 239,730,192,506.25/357,069
6. Step 6: Final answer
   x = 671,383.38