Finding the Fourth Proportional to 12,920.34, 19,383.60 and 4,155.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.34 : 19,383.60 = 4,155.27 : x
2. Step 2: Convert to fraction form
   12,920.34/19,383.60 = 4,155.27/x
3. Step 3: Cross multiply
   12,920.34x = 19,383.60 × 4,155.27
4. Step 4: Simplify right side
   12,920.34x = 80,544,034.47
5. Step 5: Solve for x
   x = 80,544,034.47/12,920.34
6. Step 6: Final answer
   x = 6,233.89