Finding the Fourth Proportional to 3,555.78, 4,907.46 and 2,158.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,555.78 : 4,907.46 = 2,158.56 : x
2. Step 2: Convert to fraction form
   3,555.78/4,907.46 = 2,158.56/x
3. Step 3: Cross multiply
   3,555.78x = 4,907.46 × 2,158.56
4. Step 4: Simplify right side
   3,555.78x = 10,593,046.86
5. Step 5: Solve for x
   x = 10,593,046.86/3,555.78
6. Step 6: Final answer
   x = 2,979.11