Finding the Fourth Proportional to 1,059.15, 1,588.56 and 328.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.15 : 1,588.56 = 328.62 : x
2. Step 2: Convert to fraction form
   1,059.15/1,588.56 = 328.62/x
3. Step 3: Cross multiply
   1,059.15x = 1,588.56 × 328.62
4. Step 4: Simplify right side
   1,059.15x = 522,032.59
5. Step 5: Solve for x
   x = 522,032.59/1,059.15
6. Step 6: Final answer
   x = 492.88