Finding the Fourth Proportional to 2,659.38, 3,987.55 and 1,098.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.38 : 3,987.55 = 1,098.91 : x
2. Step 2: Convert to fraction form
   2,659.38/3,987.55 = 1,098.91/x
3. Step 3: Cross multiply
   2,659.38x = 3,987.55 × 1,098.91
4. Step 4: Simplify right side
   2,659.38x = 4,381,958.57
5. Step 5: Solve for x
   x = 4,381,958.57/2,659.38
6. Step 6: Final answer
   x = 1,647.74