Finding the Fourth Proportional to 2,567.74, 3,543.48 and 1,388.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.74 : 3,543.48 = 1,388.81 : x
2. Step 2: Convert to fraction form
   2,567.74/3,543.48 = 1,388.81/x
3. Step 3: Cross multiply
   2,567.74x = 3,543.48 × 1,388.81
4. Step 4: Simplify right side
   2,567.74x = 4,921,210.82
5. Step 5: Solve for x
   x = 4,921,210.82/2,567.74
6. Step 6: Final answer
   x = 1,916.55