Finding the Fourth Proportional to 9,144.36, 12,619.38 and 5,165.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.36 : 12,619.38 = 5,165.52 : x
2. Step 2: Convert to fraction form
   9,144.36/12,619.38 = 5,165.52/x
3. Step 3: Cross multiply
   9,144.36x = 12,619.38 × 5,165.52
4. Step 4: Simplify right side
   9,144.36x = 65,185,659.78
5. Step 5: Solve for x
   x = 65,185,659.78/9,144.36
6. Step 6: Final answer
   x = 7,128.51