Finding the Fourth Proportional to 11,421.72, 17,134.20 and 5,183.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,421.72 : 17,134.20 = 5,183.76 : x
2. Step 2: Convert to fraction form
   11,421.72/17,134.20 = 5,183.76/x
3. Step 3: Cross multiply
   11,421.72x = 17,134.20 × 5,183.76
4. Step 4: Simplify right side
   11,421.72x = 88,819,580.59
5. Step 5: Solve for x
   x = 88,819,580.59/11,421.72
6. Step 6: Final answer
   x = 7,776.38