Finding the Fourth Proportional to 13,820.72, 20,727.42 and 5,500.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,820.72 : 20,727.42 = 5,500.40 : x
2. Step 2: Convert to fraction form
   13,820.72/20,727.42 = 5,500.40/x
3. Step 3: Cross multiply
   13,820.72x = 20,727.42 × 5,500.40
4. Step 4: Simplify right side
   13,820.72x = 114,009,100.97
5. Step 5: Solve for x
   x = 114,009,100.97/13,820.72
6. Step 6: Final answer
   x = 8,249.14