Finding the Fourth Proportional to 589,279.50, 813,205.71 and 321,007.50

Step by Step Solution

1. Step 1: Write the proportion equation
   589,279.50 : 813,205.71 = 321,007.50 : x
2. Step 2: Convert to fraction form
   589,279.50/813,205.71 = 321,007.50/x
3. Step 3: Cross multiply
   589,279.50x = 813,205.71 × 321,007.50
4. Step 4: Simplify right side
   589,279.50x = 261,045,131,952.83
5. Step 5: Solve for x
   x = 261,045,131,952.83/589,279.50
6. Step 6: Final answer
   x = 442,990.35