Finding the Fourth Proportional to 11,406.72, 15,728.27 and 9,276.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,406.72 : 15,728.27 = 9,276.42 : x
2. Step 2: Convert to fraction form
   11,406.72/15,728.27 = 9,276.42/x
3. Step 3: Cross multiply
   11,406.72x = 15,728.27 × 9,276.42
4. Step 4: Simplify right side
   11,406.72x = 145,901,992.01
5. Step 5: Solve for x
   x = 145,901,992.01/11,406.72
6. Step 6: Final answer
   x = 12,790.88