Finding the Fourth Proportional to 3,983.58, 5,976.18 and 1,386.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,983.58 : 5,976.18 = 1,386.72 : x
2. Step 2: Convert to fraction form
   3,983.58/5,976.18 = 1,386.72/x
3. Step 3: Cross multiply
   3,983.58x = 5,976.18 × 1,386.72
4. Step 4: Simplify right side
   3,983.58x = 8,287,288.33
5. Step 5: Solve for x
   x = 8,287,288.33/3,983.58
6. Step 6: Final answer
   x = 2,080.36