Finding the Fourth Proportional to 11,688.27, 17,509.73 and 10,379.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,688.27 : 17,509.73 = 10,379.31 : x
2. Step 2: Convert to fraction form
   11,688.27/17,509.73 = 10,379.31/x
3. Step 3: Cross multiply
   11,688.27x = 17,509.73 × 10,379.31
4. Step 4: Simplify right side
   11,688.27x = 181,738,863.79
5. Step 5: Solve for x
   x = 181,738,863.79/11,688.27
6. Step 6: Final answer
   x = 15,548.82