Finding the Fourth Proportional to 13,171.76, 18,176.76 and 7,866.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,171.76 : 18,176.76 = 7,866.56 : x
2. Step 2: Convert to fraction form
   13,171.76/18,176.76 = 7,866.56/x
3. Step 3: Cross multiply
   13,171.76x = 18,176.76 × 7,866.56
4. Step 4: Simplify right side
   13,171.76x = 142,988,573.15
5. Step 5: Solve for x
   x = 142,988,573.15/13,171.76
6. Step 6: Final answer
   x = 10,855.69