Finding the Fourth Proportional to 20,379.54, 30,603.24 and 13,758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,379.54 : 30,603.24 = 13,758.72 : x
2. Step 2: Convert to fraction form
   20,379.54/30,603.24 = 13,758.72/x
3. Step 3: Cross multiply
   20,379.54x = 30,603.24 × 13,758.72
4. Step 4: Simplify right side
   20,379.54x = 421,061,410.25
5. Step 5: Solve for x
   x = 421,061,410.25/20,379.54
6. Step 6: Final answer
   x = 20,660.99