Finding the Fourth Proportional to 2,567.47, 3,543.12 and 1,388.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.47 : 3,543.12 = 1,388.55 : x
2. Step 2: Convert to fraction form
   2,567.47/3,543.12 = 1,388.55/x
3. Step 3: Cross multiply
   2,567.47x = 3,543.12 × 1,388.55
4. Step 4: Simplify right side
   2,567.47x = 4,919,799.28
5. Step 5: Solve for x
   x = 4,919,799.28/2,567.47
6. Step 6: Final answer
   x = 1,916.21