Finding the Fourth Proportional to 11,181.82, 15,423.10 and 9,491.57

Step by Step Solution

1. Step 1: Write the proportion equation
   11,181.82 : 15,423.10 = 9,491.57 : x
2. Step 2: Convert to fraction form
   11,181.82/15,423.10 = 9,491.57/x
3. Step 3: Cross multiply
   11,181.82x = 15,423.10 × 9,491.57
4. Step 4: Simplify right side
   11,181.82x = 146,389,433.27
5. Step 5: Solve for x
   x = 146,389,433.27/11,181.82
6. Step 6: Final answer
   x = 13,091.74