Finding the Fourth Proportional to 20,146.72, 27,793.52 and 13,425.80

Step by Step Solution

1. Step 1: Write the proportion equation
   20,146.72 : 27,793.52 = 13,425.80 : x
2. Step 2: Convert to fraction form
   20,146.72/27,793.52 = 13,425.80/x
3. Step 3: Cross multiply
   20,146.72x = 27,793.52 × 13,425.80
4. Step 4: Simplify right side
   20,146.72x = 373,150,240.82
5. Step 5: Solve for x
   x = 373,150,240.82/20,146.72
6. Step 6: Final answer
   x = 18,521.64