Finding the Fourth Proportional to 2,567.34, 3,542.92 and 1,388.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.34 : 3,542.92 = 1,388.40 : x
2. Step 2: Convert to fraction form
   2,567.34/3,542.92 = 1,388.40/x
3. Step 3: Cross multiply
   2,567.34x = 3,542.92 × 1,388.40
4. Step 4: Simplify right side
   2,567.34x = 4,918,990.13
5. Step 5: Solve for x
   x = 4,918,990.13/2,567.34
6. Step 6: Final answer
   x = 1,915.99