Finding the Fourth Proportional to 30,729.48, 42,413.58 and 20,112.93

Step by Step Solution

1. Step 1: Write the proportion equation
   30,729.48 : 42,413.58 = 20,112.93 : x
2. Step 2: Convert to fraction form
   30,729.48/42,413.58 = 20,112.93/x
3. Step 3: Cross multiply
   30,729.48x = 42,413.58 × 20,112.93
4. Step 4: Simplify right side
   30,729.48x = 853,061,365.59
5. Step 5: Solve for x
   x = 853,061,365.59/30,729.48
6. Step 6: Final answer
   x = 27,760.36