Finding the Fourth Proportional to 9,144.93, 12,619.79 and 5,165.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.93 : 12,619.79 = 5,165.91 : x
2. Step 2: Convert to fraction form
   9,144.93/12,619.79 = 5,165.91/x
3. Step 3: Cross multiply
   9,144.93x = 12,619.79 × 5,165.91
4. Step 4: Simplify right side
   9,144.93x = 65,192,673.53
5. Step 5: Solve for x
   x = 65,192,673.53/9,144.93
6. Step 6: Final answer
   x = 7,128.83