Finding the Fourth Proportional to 18,942.42, 28,413.61 and 5,091.42

Step by Step Solution

1. Step 1: Write the proportion equation
   18,942.42 : 28,413.61 = 5,091.42 : x
2. Step 2: Convert to fraction form
   18,942.42/28,413.61 = 5,091.42/x
3. Step 3: Cross multiply
   18,942.42x = 28,413.61 × 5,091.42
4. Step 4: Simplify right side
   18,942.42x = 144,665,622.23
5. Step 5: Solve for x
   x = 144,665,622.23/18,942.42
6. Step 6: Final answer
   x = 7,637.12