Finding the Fourth Proportional to 2,987.69, 4,481.55 and 1,039.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.69 : 4,481.55 = 1,039.88 : x
2. Step 2: Convert to fraction form
   2,987.69/4,481.55 = 1,039.88/x
3. Step 3: Cross multiply
   2,987.69x = 4,481.55 × 1,039.88
4. Step 4: Simplify right side
   2,987.69x = 4,660,285.42
5. Step 5: Solve for x
   x = 4,660,285.42/2,987.69
6. Step 6: Final answer
   x = 1,559.83