Finding the Fourth Proportional to 2,567.54, 3,543.20 and 1,388.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.54 : 3,543.20 = 1,388.60 : x
2. Step 2: Convert to fraction form
   2,567.54/3,543.20 = 1,388.60/x
3. Step 3: Cross multiply
   2,567.54x = 3,543.20 × 1,388.60
4. Step 4: Simplify right side
   2,567.54x = 4,920,089.43
5. Step 5: Solve for x
   x = 4,920,089.43/2,567.54
6. Step 6: Final answer
   x = 1,916.27