Finding the Fourth Proportional to 2,567.42, 3,543.05 and 1,388.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.42 : 3,543.05 = 1,388.50 : x
2. Step 2: Convert to fraction form
   2,567.42/3,543.05 = 1,388.50/x
3. Step 3: Cross multiply
   2,567.42x = 3,543.05 × 1,388.50
4. Step 4: Simplify right side
   2,567.42x = 4,919,500.27
5. Step 5: Solve for x
   x = 4,919,500.27/2,567.42
6. Step 6: Final answer
   x = 1,916.13