Finding the Fourth Proportional to 11,663.92, 16,091.60 and 7,686.96

Step by Step Solution

1. Step 1: Write the proportion equation
   11,663.92 : 16,091.60 = 7,686.96 : x
2. Step 2: Convert to fraction form
   11,663.92/16,091.60 = 7,686.96/x
3. Step 3: Cross multiply
   11,663.92x = 16,091.60 × 7,686.96
4. Step 4: Simplify right side
   11,663.92x = 123,695,485.54
5. Step 5: Solve for x
   x = 123,695,485.54/11,663.92
6. Step 6: Final answer
   x = 10,604.97