Finding the Fourth Proportional to 11,423.21, 17,132.72 and 5,181.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,423.21 : 17,132.72 = 5,181.71 : x
2. Step 2: Convert to fraction form
   11,423.21/17,132.72 = 5,181.71/x
3. Step 3: Cross multiply
   11,423.21x = 17,132.72 × 5,181.71
4. Step 4: Simplify right side
   11,423.21x = 88,776,786.55
5. Step 5: Solve for x
   x = 88,776,786.55/11,423.21
6. Step 6: Final answer
   x = 7,771.61