Finding the Fourth Proportional to 712.72, 1,069.23 and 404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   712.72 : 1,069.23 = 404.72 : x
2. Step 2: Convert to fraction form
   712.72/1,069.23 = 404.72/x
3. Step 3: Cross multiply
   712.72x = 1,069.23 × 404.72
4. Step 4: Simplify right side
   712.72x = 432,738.77
5. Step 5: Solve for x
   x = 432,738.77/712.72
6. Step 6: Final answer
   x = 607.17