Finding the Fourth Proportional to 3,449.61, 5,175.72 and 1,987.97

Step by Step Solution

1. Step 1: Write the proportion equation
   3,449.61 : 5,175.72 = 1,987.97 : x
2. Step 2: Convert to fraction form
   3,449.61/5,175.72 = 1,987.97/x
3. Step 3: Cross multiply
   3,449.61x = 5,175.72 × 1,987.97
4. Step 4: Simplify right side
   3,449.61x = 10,289,150.21
5. Step 5: Solve for x
   x = 10,289,150.21/3,449.61
6. Step 6: Final answer
   x = 2,982.70