Finding the Fourth Proportional to 993.32, 1,488.50 and 680.57

Step by Step Solution

1. Step 1: Write the proportion equation
   993.32 : 1,488.50 = 680.57 : x
2. Step 2: Convert to fraction form
   993.32/1,488.50 = 680.57/x
3. Step 3: Cross multiply
   993.32x = 1,488.50 × 680.57
4. Step 4: Simplify right side
   993.32x = 1,013,028.45
5. Step 5: Solve for x
   x = 1,013,028.45/993.32
6. Step 6: Final answer
   x = 1,019.84