Finding the Fourth Proportional to 20,106.38, 30,128.80 and 10,747.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,106.38 : 30,128.80 = 10,747.72 : x
2. Step 2: Convert to fraction form
   20,106.38/30,128.80 = 10,747.72/x
3. Step 3: Cross multiply
   20,106.38x = 30,128.80 × 10,747.72
4. Step 4: Simplify right side
   20,106.38x = 323,815,852.60
5. Step 5: Solve for x
   x = 323,815,852.60/20,106.38
6. Step 6: Final answer
   x = 16,105.13