Finding the Fourth Proportional to 2,567.65, 3,543.35 and 1,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.65 : 3,543.35 = 1,388.72 : x
2. Step 2: Convert to fraction form
   2,567.65/3,543.35 = 1,388.72/x
3. Step 3: Cross multiply
   2,567.65x = 3,543.35 × 1,388.72
4. Step 4: Simplify right side
   2,567.65x = 4,920,721.01
5. Step 5: Solve for x
   x = 4,920,721.01/2,567.65
6. Step 6: Final answer
   x = 1,916.43