Finding the Fourth Proportional to 9,140.24, 12,612.40 and 5,161.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,140.24 : 12,612.40 = 5,161.12 : x
2. Step 2: Convert to fraction form
   9,140.24/12,612.40 = 5,161.12/x
3. Step 3: Cross multiply
   9,140.24x = 12,612.40 × 5,161.12
4. Step 4: Simplify right side
   9,140.24x = 65,094,109.89
5. Step 5: Solve for x
   x = 65,094,109.89/9,140.24
6. Step 6: Final answer
   x = 7,121.71