Finding the Fourth Proportional to 5,435.78, 8,150.90 and 2,658.29

Step by Step Solution

1. Step 1: Write the proportion equation
   5,435.78 : 8,150.90 = 2,658.29 : x
2. Step 2: Convert to fraction form
   5,435.78/8,150.90 = 2,658.29/x
3. Step 3: Cross multiply
   5,435.78x = 8,150.90 × 2,658.29
4. Step 4: Simplify right side
   5,435.78x = 21,667,401.92
5. Step 5: Solve for x
   x = 21,667,401.92/5,435.78
6. Step 6: Final answer
   x = 3,986.07