Finding the Fourth Proportional to 2,681.40, 4,020.72 and 1,038.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,681.40 : 4,020.72 = 1,038.42 : x
2. Step 2: Convert to fraction form
   2,681.40/4,020.72 = 1,038.42/x
3. Step 3: Cross multiply
   2,681.40x = 4,020.72 × 1,038.42
4. Step 4: Simplify right side
   2,681.40x = 4,175,196.06
5. Step 5: Solve for x
   x = 4,175,196.06/2,681.40
6. Step 6: Final answer
   x = 1,557.10