Finding the Fourth Proportional to 13,789.92, 20,658.80 and 8,150.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,789.92 : 20,658.80 = 8,150.72 : x
2. Step 2: Convert to fraction form
   13,789.92/20,658.80 = 8,150.72/x
3. Step 3: Cross multiply
   13,789.92x = 20,658.80 × 8,150.72
4. Step 4: Simplify right side
   13,789.92x = 168,384,094.34
5. Step 5: Solve for x
   x = 168,384,094.34/13,789.92
6. Step 6: Final answer
   x = 12,210.67