Finding the Fourth Proportional to 3,847.61, 5,309.36 and 2,168.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,847.61 : 5,309.36 = 2,168.89 : x
2. Step 2: Convert to fraction form
   3,847.61/5,309.36 = 2,168.89/x
3. Step 3: Cross multiply
   3,847.61x = 5,309.36 × 2,168.89
4. Step 4: Simplify right side
   3,847.61x = 11,515,401.83
5. Step 5: Solve for x
   x = 11,515,401.83/3,847.61
6. Step 6: Final answer
   x = 2,992.87