Finding the Fourth Proportional to 19,601.72, 29,386.17 and 13,661.18

Step by Step Solution

1. Step 1: Write the proportion equation
   19,601.72 : 29,386.17 = 13,661.18 : x
2. Step 2: Convert to fraction form
   19,601.72/29,386.17 = 13,661.18/x
3. Step 3: Cross multiply
   19,601.72x = 29,386.17 × 13,661.18
4. Step 4: Simplify right side
   19,601.72x = 401,449,765.37
5. Step 5: Solve for x
   x = 401,449,765.37/19,601.72
6. Step 6: Final answer
   x = 20,480.33