Finding the Fourth Proportional to 1,059.35, 1,588.59 and 442.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.35 : 1,588.59 = 442.73 : x
2. Step 2: Convert to fraction form
   1,059.35/1,588.59 = 442.73/x
3. Step 3: Cross multiply
   1,059.35x = 1,588.59 × 442.73
4. Step 4: Simplify right side
   1,059.35x = 703,308.51
5. Step 5: Solve for x
   x = 703,308.51/1,059.35
6. Step 6: Final answer
   x = 663.91