Finding the Fourth Proportional to 30,997.47, 42,761.48 and 18,413.31

Step by Step Solution

1. Step 1: Write the proportion equation
   30,997.47 : 42,761.48 = 18,413.31 : x
2. Step 2: Convert to fraction form
   30,997.47/42,761.48 = 18,413.31/x
3. Step 3: Cross multiply
   30,997.47x = 42,761.48 × 18,413.31
4. Step 4: Simplify right side
   30,997.47x = 787,380,295.23
5. Step 5: Solve for x
   x = 787,380,295.23/30,997.47
6. Step 6: Final answer
   x = 25,401.44