Finding the Fourth Proportional to 1,053.73, 1,580.64 and 404.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.73 : 1,580.64 = 404.56 : x
2. Step 2: Convert to fraction form
   1,053.73/1,580.64 = 404.56/x
3. Step 3: Cross multiply
   1,053.73x = 1,580.64 × 404.56
4. Step 4: Simplify right side
   1,053.73x = 639,463.72
5. Step 5: Solve for x
   x = 639,463.72/1,053.73
6. Step 6: Final answer
   x = 606.86