Finding the Fourth Proportional to 13,171.76, 18,177.32 and 7,865.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,171.76 : 18,177.32 = 7,865.59 : x
2. Step 2: Convert to fraction form
   13,171.76/18,177.32 = 7,865.59/x
3. Step 3: Cross multiply
   13,171.76x = 18,177.32 × 7,865.59
4. Step 4: Simplify right side
   13,171.76x = 142,975,346.42
5. Step 5: Solve for x
   x = 142,975,346.42/13,171.76
6. Step 6: Final answer
   x = 10,854.69