Finding the Fourth Proportional to 2,567.28, 3,542.82 and 1,388.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.28 : 3,542.82 = 1,388.35 : x
2. Step 2: Convert to fraction form
   2,567.28/3,542.82 = 1,388.35/x
3. Step 3: Cross multiply
   2,567.28x = 3,542.82 × 1,388.35
4. Step 4: Simplify right side
   2,567.28x = 4,918,674.15
5. Step 5: Solve for x
   x = 4,918,674.15/2,567.28
6. Step 6: Final answer
   x = 1,915.91