Finding the Fourth Proportional to 2,078.58, 2,867.16 and 1,238.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.58 : 2,867.16 = 1,238.72 : x
2. Step 2: Convert to fraction form
   2,078.58/2,867.16 = 1,238.72/x
3. Step 3: Cross multiply
   2,078.58x = 2,867.16 × 1,238.72
4. Step 4: Simplify right side
   2,078.58x = 3,551,608.44
5. Step 5: Solve for x
   x = 3,551,608.44/2,078.58
6. Step 6: Final answer
   x = 1,708.67