Finding the Fourth Proportional to 3,319.82, 4,979.86 and 1,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,319.82 : 4,979.86 = 1,128.56 : x
2. Step 2: Convert to fraction form
   3,319.82/4,979.86 = 1,128.56/x
3. Step 3: Cross multiply
   3,319.82x = 4,979.86 × 1,128.56
4. Step 4: Simplify right side
   3,319.82x = 5,620,080.43
5. Step 5: Solve for x
   x = 5,620,080.43/3,319.82
6. Step 6: Final answer
   x = 1,692.89