Finding the Fourth Proportional to 449,500.50, 620,047.98 and 279,789.30

Step by Step Solution

1. Step 1: Write the proportion equation
   449,500.50 : 620,047.98 = 279,789.30 : x
2. Step 2: Convert to fraction form
   449,500.50/620,047.98 = 279,789.30/x
3. Step 3: Cross multiply
   449,500.50x = 620,047.98 × 279,789.30
4. Step 4: Simplify right side
   449,500.50x = 173,482,790,290.61
5. Step 5: Solve for x
   x = 173,482,790,290.61/449,500.50
6. Step 6: Final answer
   x = 385,945.71