Finding the Fourth Proportional to 12,221.33, 16,856.72 and 11,216.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,221.33 : 16,856.72 = 11,216.27 : x
2. Step 2: Convert to fraction form
   12,221.33/16,856.72 = 11,216.27/x
3. Step 3: Cross multiply
   12,221.33x = 16,856.72 × 11,216.27
4. Step 4: Simplify right side
   12,221.33x = 189,069,477.29
5. Step 5: Solve for x
   x = 189,069,477.29/12,221.33
6. Step 6: Final answer
   x = 15,470.46