Finding the Fourth Proportional to 1,008.58, 1,513.12 and 488.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.58 : 1,513.12 = 488.83 : x
2. Step 2: Convert to fraction form
   1,008.58/1,513.12 = 488.83/x
3. Step 3: Cross multiply
   1,008.58x = 1,513.12 × 488.83
4. Step 4: Simplify right side
   1,008.58x = 739,650.88
5. Step 5: Solve for x
   x = 739,650.88/1,008.58
6. Step 6: Final answer
   x = 733.36