Finding the Fourth Proportional to 911.82, 1,367.72 and 479.82

Step by Step Solution

1. Step 1: Write the proportion equation
   911.82 : 1,367.72 = 479.82 : x
2. Step 2: Convert to fraction form
   911.82/1,367.72 = 479.82/x
3. Step 3: Cross multiply
   911.82x = 1,367.72 × 479.82
4. Step 4: Simplify right side
   911.82x = 656,259.41
5. Step 5: Solve for x
   x = 656,259.41/911.82
6. Step 6: Final answer
   x = 719.72