Finding the Fourth Proportional to 355,930.79, 491,413.72 and 317,624.46

Step by Step Solution

1. Step 1: Write the proportion equation
   355,930.79 : 491,413.72 = 317,624.46 : x
2. Step 2: Convert to fraction form
   355,930.79/491,413.72 = 317,624.46/x
3. Step 3: Cross multiply
   355,930.79x = 491,413.72 × 317,624.46
4. Step 4: Simplify right side
   355,930.79x = 156,085,017,451.59
5. Step 5: Solve for x
   x = 156,085,017,451.59/355,930.79
6. Step 6: Final answer
   x = 438,526.31