Finding the Fourth Proportional to 13,305.28, 19,945.12 and 5,910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,305.28 : 19,945.12 = 5,910.72 : x
2. Step 2: Convert to fraction form
   13,305.28/19,945.12 = 5,910.72/x
3. Step 3: Cross multiply
   13,305.28x = 19,945.12 × 5,910.72
4. Step 4: Simplify right side
   13,305.28x = 117,890,019.69
5. Step 5: Solve for x
   x = 117,890,019.69/13,305.28
6. Step 6: Final answer
   x = 8,860.39