Finding the Fourth Proportional to 11,405.42, 17,078.27 and 9,172.38

Step by Step Solution

1. Step 1: Write the proportion equation
   11,405.42 : 17,078.27 = 9,172.38 : x
2. Step 2: Convert to fraction form
   11,405.42/17,078.27 = 9,172.38/x
3. Step 3: Cross multiply
   11,405.42x = 17,078.27 × 9,172.38
4. Step 4: Simplify right side
   11,405.42x = 156,648,382.18
5. Step 5: Solve for x
   x = 156,648,382.18/11,405.42
6. Step 6: Final answer
   x = 13,734.56