Finding the Fourth Proportional to 11,127.96, 15,340.32 and 7,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   11,127.96 : 15,340.32 = 7,978.68 : x
2. Step 2: Convert to fraction form
   11,127.96/15,340.32 = 7,978.68/x
3. Step 3: Cross multiply
   11,127.96x = 15,340.32 × 7,978.68
4. Step 4: Simplify right side
   11,127.96x = 122,395,504.38
5. Step 5: Solve for x
   x = 122,395,504.38/11,127.96
6. Step 6: Final answer
   x = 10,998.92