Finding the Fourth Proportional to 11,379.88, 17,072.70 and 3,171.88

Step by Step Solution

1. Step 1: Write the proportion equation
   11,379.88 : 17,072.70 = 3,171.88 : x
2. Step 2: Convert to fraction form
   11,379.88/17,072.70 = 3,171.88/x
3. Step 3: Cross multiply
   11,379.88x = 17,072.70 × 3,171.88
4. Step 4: Simplify right side
   11,379.88x = 54,152,454.45
5. Step 5: Solve for x
   x = 54,152,454.45/11,379.88
6. Step 6: Final answer
   x = 4,758.62