Finding the Fourth Proportional to 2,567.81, 3,543.57 and 1,388.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.81 : 3,543.57 = 1,388.88 : x
2. Step 2: Convert to fraction form
   2,567.81/3,543.57 = 1,388.88/x
3. Step 3: Cross multiply
   2,567.81x = 3,543.57 × 1,388.88
4. Step 4: Simplify right side
   2,567.81x = 4,921,593.50
5. Step 5: Solve for x
   x = 4,921,593.50/2,567.81
6. Step 6: Final answer
   x = 1,916.65