Finding the Fourth Proportional to 13,849.18, 20,777.34 and 3,989.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,849.18 : 20,777.34 = 3,989.23 : x
2. Step 2: Convert to fraction form
   13,849.18/20,777.34 = 3,989.23/x
3. Step 3: Cross multiply
   13,849.18x = 20,777.34 × 3,989.23
4. Step 4: Simplify right side
   13,849.18x = 82,885,667.94
5. Step 5: Solve for x
   x = 82,885,667.94/13,849.18
6. Step 6: Final answer
   x = 5,984.88