Finding the Fourth Proportional to 479.88, 719.69 and 171.69

Step by Step Solution

1. Step 1: Write the proportion equation
   479.88 : 719.69 = 171.69 : x
2. Step 2: Convert to fraction form
   479.88/719.69 = 171.69/x
3. Step 3: Cross multiply
   479.88x = 719.69 × 171.69
4. Step 4: Simplify right side
   479.88x = 123,562.72
5. Step 5: Solve for x
   x = 123,562.72/479.88
6. Step 6: Final answer
   x = 257.49