Finding the Fourth Proportional to 2,658.06, 3,987.36 and 1,098.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.06 : 3,987.36 = 1,098.72 : x
2. Step 2: Convert to fraction form
   2,658.06/3,987.36 = 1,098.72/x
3. Step 3: Cross multiply
   2,658.06x = 3,987.36 × 1,098.72
4. Step 4: Simplify right side
   2,658.06x = 4,380,992.18
5. Step 5: Solve for x
   x = 4,380,992.18/2,658.06
6. Step 6: Final answer
   x = 1,648.19