Finding the Fourth Proportional to 7,109.72, 9,811.48 and 3,923.16

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.72 : 9,811.48 = 3,923.16 : x
2. Step 2: Convert to fraction form
   7,109.72/9,811.48 = 3,923.16/x
3. Step 3: Cross multiply
   7,109.72x = 9,811.48 × 3,923.16
4. Step 4: Simplify right side
   7,109.72x = 38,491,971.54
5. Step 5: Solve for x
   x = 38,491,971.54/7,109.72
6. Step 6: Final answer
   x = 5,413.99