Finding the Fourth Proportional to 13,139.42, 19,711.37 and 5,743.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.42 : 19,711.37 = 5,743.72 : x
2. Step 2: Convert to fraction form
   13,139.42/19,711.37 = 5,743.72/x
3. Step 3: Cross multiply
   13,139.42x = 19,711.37 × 5,743.72
4. Step 4: Simplify right side
   13,139.42x = 113,216,512.10
5. Step 5: Solve for x
   x = 113,216,512.10/13,139.42
6. Step 6: Final answer
   x = 8,616.55