Finding the Fourth Proportional to 11,014.32, 15,221.61 and 9,021.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,014.32 : 15,221.61 = 9,021.72 : x
2. Step 2: Convert to fraction form
   11,014.32/15,221.61 = 9,021.72/x
3. Step 3: Cross multiply
   11,014.32x = 15,221.61 × 9,021.72
4. Step 4: Simplify right side
   11,014.32x = 137,325,103.37
5. Step 5: Solve for x
   x = 137,325,103.37/11,014.32
6. Step 6: Final answer
   x = 12,467.87