Finding the Fourth Proportional to 11,155.10, 15,390.92 and 7,969.37

Step by Step Solution

1. Step 1: Write the proportion equation
   11,155.10 : 15,390.92 = 7,969.37 : x
2. Step 2: Convert to fraction form
   11,155.10/15,390.92 = 7,969.37/x
3. Step 3: Cross multiply
   11,155.10x = 15,390.92 × 7,969.37
4. Step 4: Simplify right side
   11,155.10x = 122,655,819.32
5. Step 5: Solve for x
   x = 122,655,819.32/11,155.10
6. Step 6: Final answer
   x = 10,995.50