Finding the Fourth Proportional to 5,401.62, 8,103.65 and 3,907.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,401.62 : 8,103.65 = 3,907.78 : x
2. Step 2: Convert to fraction form
   5,401.62/8,103.65 = 3,907.78/x
3. Step 3: Cross multiply
   5,401.62x = 8,103.65 × 3,907.78
4. Step 4: Simplify right side
   5,401.62x = 31,667,241.60
5. Step 5: Solve for x
   x = 31,667,241.60/5,401.62
6. Step 6: Final answer
   x = 5,862.55