Finding the Fourth Proportional to 2,638.27, 3,957.86 and 1,079.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.27 : 3,957.86 = 1,079.12 : x
2. Step 2: Convert to fraction form
   2,638.27/3,957.86 = 1,079.12/x
3. Step 3: Cross multiply
   2,638.27x = 3,957.86 × 1,079.12
4. Step 4: Simplify right side
   2,638.27x = 4,271,005.88
5. Step 5: Solve for x
   x = 4,271,005.88/2,638.27
6. Step 6: Final answer
   x = 1,618.87