Finding the Fourth Proportional to 12,944.16, 17,856.72 and 9,220.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,944.16 : 17,856.72 = 9,220.32 : x
2. Step 2: Convert to fraction form
   12,944.16/17,856.72 = 9,220.32/x
3. Step 3: Cross multiply
   12,944.16x = 17,856.72 × 9,220.32
4. Step 4: Simplify right side
   12,944.16x = 164,644,672.55
5. Step 5: Solve for x
   x = 164,644,672.55/12,944.16
6. Step 6: Final answer
   x = 12,719.61