Finding the Fourth Proportional to 3,418.49, 5,128.43 and 1,078.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.49 : 5,128.43 = 1,078.86 : x
2. Step 2: Convert to fraction form
   3,418.49/5,128.43 = 1,078.86/x
3. Step 3: Cross multiply
   3,418.49x = 5,128.43 × 1,078.86
4. Step 4: Simplify right side
   3,418.49x = 5,532,842.98
5. Step 5: Solve for x
   x = 5,532,842.98/3,418.49
6. Step 6: Final answer
   x = 1,618.50