Finding the Fourth Proportional to 1,059.48, 1,588.52 and 443.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.48 : 1,588.52 = 443.60 : x
2. Step 2: Convert to fraction form
   1,059.48/1,588.52 = 443.60/x
3. Step 3: Cross multiply
   1,059.48x = 1,588.52 × 443.60
4. Step 4: Simplify right side
   1,059.48x = 704,667.47
5. Step 5: Solve for x
   x = 704,667.47/1,059.48
6. Step 6: Final answer
   x = 665.11