Finding the Fourth Proportional to 2,569.34, 3,545.69 and 1,390.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,569.34 : 3,545.69 = 1,390.41 : x
2. Step 2: Convert to fraction form
   2,569.34/3,545.69 = 1,390.41/x
3. Step 3: Cross multiply
   2,569.34x = 3,545.69 × 1,390.41
4. Step 4: Simplify right side
   2,569.34x = 4,929,955.88
5. Step 5: Solve for x
   x = 4,929,955.88/2,569.34
6. Step 6: Final answer
   x = 1,918.77