Finding the Fourth Proportional to 443,100.78, 609,939.72 and 386,413.74

Step by Step Solution

1. Step 1: Write the proportion equation
   443,100.78 : 609,939.72 = 386,413.74 : x
2. Step 2: Convert to fraction form
   443,100.78/609,939.72 = 386,413.74/x
3. Step 3: Cross multiply
   443,100.78x = 609,939.72 × 386,413.74
4. Step 4: Simplify right side
   443,100.78x = 235,689,088,379.75
5. Step 5: Solve for x
   x = 235,689,088,379.75/443,100.78
6. Step 6: Final answer
   x = 531,908.54