Finding the Fourth Proportional to 11,667.78, 16,104.24 and 7,689.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,667.78 : 16,104.24 = 7,689.60 : x
2. Step 2: Convert to fraction form
   11,667.78/16,104.24 = 7,689.60/x
3. Step 3: Cross multiply
   11,667.78x = 16,104.24 × 7,689.60
4. Step 4: Simplify right side
   11,667.78x = 123,835,163.90
5. Step 5: Solve for x
   x = 123,835,163.90/11,667.78
6. Step 6: Final answer
   x = 10,613.43