Finding the Fourth Proportional to 9,141.72, 12,616.20 and 5,161.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,141.72 : 12,616.20 = 5,161.38 : x
2. Step 2: Convert to fraction form
   9,141.72/12,616.20 = 5,161.38/x
3. Step 3: Cross multiply
   9,141.72x = 12,616.20 × 5,161.38
4. Step 4: Simplify right side
   9,141.72x = 65,117,002.36
5. Step 5: Solve for x
   x = 65,117,002.36/9,141.72
6. Step 6: Final answer
   x = 7,123.06