Finding the Fourth Proportional to 9,137.92, 12,609.72 and 5,159.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,137.92 : 12,609.72 = 5,159.20 : x
2. Step 2: Convert to fraction form
   9,137.92/12,609.72 = 5,159.20/x
3. Step 3: Cross multiply
   9,137.92x = 12,609.72 × 5,159.20
4. Step 4: Simplify right side
   9,137.92x = 65,056,067.42
5. Step 5: Solve for x
   x = 65,056,067.42/9,137.92
6. Step 6: Final answer
   x = 7,119.35