Finding the Fourth Proportional to 417.69, 576.72 and 386.59

Step by Step Solution

1. Step 1: Write the proportion equation
   417.69 : 576.72 = 386.59 : x
2. Step 2: Convert to fraction form
   417.69/576.72 = 386.59/x
3. Step 3: Cross multiply
   417.69x = 576.72 × 386.59
4. Step 4: Simplify right side
   417.69x = 222,953.82
5. Step 5: Solve for x
   x = 222,953.82/417.69
6. Step 6: Final answer
   x = 533.78