Finding the Fourth Proportional to 1,053.44, 1,580.78 and 404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.44 : 1,580.78 = 404.72 : x
2. Step 2: Convert to fraction form
   1,053.44/1,580.78 = 404.72/x
3. Step 3: Cross multiply
   1,053.44x = 1,580.78 × 404.72
4. Step 4: Simplify right side
   1,053.44x = 639,766.39
5. Step 5: Solve for x
   x = 639,766.39/1,053.44
6. Step 6: Final answer
   x = 607.31