Finding the Fourth Proportional to 656,384.50, 905,810.61 and 354,578.50

Step by Step Solution

1. Step 1: Write the proportion equation
   656,384.50 : 905,810.61 = 354,578.50 : x
2. Step 2: Convert to fraction form
   656,384.50/905,810.61 = 354,578.50/x
3. Step 3: Cross multiply
   656,384.50x = 905,810.61 × 354,578.50
4. Step 4: Simplify right side
   656,384.50x = 321,180,967,377.89
5. Step 5: Solve for x
   x = 321,180,967,377.89/656,384.50
6. Step 6: Final answer
   x = 489,318.33