Finding the Fourth Proportional to 2,567.95, 3,543.80 and 1,389.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,567.95 : 3,543.80 = 1,389.05 : x
2. Step 2: Convert to fraction form
   2,567.95/3,543.80 = 1,389.05/x
3. Step 3: Cross multiply
   2,567.95x = 3,543.80 × 1,389.05
4. Step 4: Simplify right side
   2,567.95x = 4,922,511.83
5. Step 5: Solve for x
   x = 4,922,511.83/2,567.95
6. Step 6: Final answer
   x = 1,916.90