Finding the Fourth Proportional to 256.72, 354.06 and 173.69

Step by Step Solution

1. Step 1: Write the proportion equation
   256.72 : 354.06 = 173.69 : x
2. Step 2: Convert to fraction form
   256.72/354.06 = 173.69/x
3. Step 3: Cross multiply
   256.72x = 354.06 × 173.69
4. Step 4: Simplify right side
   256.72x = 61,498.72
5. Step 5: Solve for x
   x = 61,498.72/256.72
6. Step 6: Final answer
   x = 239.56