Finding the Fourth Proportional to 13,648.29, 20,465.60 and 4,288.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,648.29 : 20,465.60 = 4,288.18 : x
2. Step 2: Convert to fraction form
   13,648.29/20,465.60 = 4,288.18/x
3. Step 3: Cross multiply
   13,648.29x = 20,465.60 × 4,288.18
4. Step 4: Simplify right side
   13,648.29x = 87,760,142.38
5. Step 5: Solve for x
   x = 87,760,142.38/13,648.29
6. Step 6: Final answer
   x = 6,430.12