Finding the Fourth Proportional to 3,318.72, 4,978.49 and 1,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   3,318.72 : 4,978.49 = 1,128.08 : x
2. Step 2: Convert to fraction form
   3,318.72/4,978.49 = 1,128.08/x
3. Step 3: Cross multiply
   3,318.72x = 4,978.49 × 1,128.08
4. Step 4: Simplify right side
   3,318.72x = 5,616,104.47
5. Step 5: Solve for x
   x = 5,616,104.47/3,318.72
6. Step 6: Final answer
   x = 1,692.25