Finding the Fourth Proportional to 2,587.38, 3,878.94 and 1,026.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.38 : 3,878.94 = 1,026.72 : x
2. Step 2: Convert to fraction form
   2,587.38/3,878.94 = 1,026.72/x
3. Step 3: Cross multiply
   2,587.38x = 3,878.94 × 1,026.72
4. Step 4: Simplify right side
   2,587.38x = 3,982,585.28
5. Step 5: Solve for x
   x = 3,982,585.28/2,587.38
6. Step 6: Final answer
   x = 1,539.23