Finding the Fourth Proportional to 20,603.82, 30,870.42 and 13,836.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,603.82 : 30,870.42 = 13,836.72 : x
2. Step 2: Convert to fraction form
   20,603.82/30,870.42 = 13,836.72/x
3. Step 3: Cross multiply
   20,603.82x = 30,870.42 × 13,836.72
4. Step 4: Simplify right side
   20,603.82x = 427,145,357.82
5. Step 5: Solve for x
   x = 427,145,357.82/20,603.82
6. Step 6: Final answer
   x = 20,731.37