Finding the Fourth Proportional to 3,543.62, 5,315.42 and 1,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,543.62 : 5,315.42 = 1,078.72 : x
2. Step 2: Convert to fraction form
   3,543.62/5,315.42 = 1,078.72/x
3. Step 3: Cross multiply
   3,543.62x = 5,315.42 × 1,078.72
4. Step 4: Simplify right side
   3,543.62x = 5,733,839.27
5. Step 5: Solve for x
   x = 5,733,839.27/3,543.62
6. Step 6: Final answer
   x = 1,618.08