Finding the Fourth Proportional to 644,016.20, 967,061.10 and 486,422.60

Step by Step Solution

1. Step 1: Write the proportion equation
   644,016.20 : 967,061.10 = 486,422.60 : x
2. Step 2: Convert to fraction form
   644,016.20/967,061.10 = 486,422.60/x
3. Step 3: Cross multiply
   644,016.20x = 967,061.10 × 486,422.60
4. Step 4: Simplify right side
   644,016.20x = 470,400,374,620.86
5. Step 5: Solve for x
   x = 470,400,374,620.86/644,016.20
6. Step 6: Final answer
   x = 730,416.99