Finding the Fourth Proportional to 9,410.45, 12,986.13 and 5,161.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.45 : 12,986.13 = 5,161.29 : x
2. Step 2: Convert to fraction form
   9,410.45/12,986.13 = 5,161.29/x
3. Step 3: Cross multiply
   9,410.45x = 12,986.13 × 5,161.29
4. Step 4: Simplify right side
   9,410.45x = 67,025,182.91
5. Step 5: Solve for x
   x = 67,025,182.91/9,410.45
6. Step 6: Final answer
   x = 7,122.42