Finding the Fourth Proportional to 19,631.93, 29,436.71 and 13,399.49

Step by Step Solution

1. Step 1: Write the proportion equation
   19,631.93 : 29,436.71 = 13,399.49 : x
2. Step 2: Convert to fraction form
   19,631.93/29,436.71 = 13,399.49/x
3. Step 3: Cross multiply
   19,631.93x = 29,436.71 × 13,399.49
4. Step 4: Simplify right side
   19,631.93x = 394,436,867.78
5. Step 5: Solve for x
   x = 394,436,867.78/19,631.93
6. Step 6: Final answer
   x = 20,091.60