Finding the Fourth Proportional to 11,109.38, 15,309.83 and 7,960.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,109.38 : 15,309.83 = 7,960.10 : x
2. Step 2: Convert to fraction form
   11,109.38/15,309.83 = 7,960.10/x
3. Step 3: Cross multiply
   11,109.38x = 15,309.83 × 7,960.10
4. Step 4: Simplify right side
   11,109.38x = 121,867,777.78
5. Step 5: Solve for x
   x = 121,867,777.78/11,109.38
6. Step 6: Final answer
   x = 10,969.81