Finding the Fourth Proportional to 9,140.48, 12,613.76 and 5,161.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,140.48 : 12,613.76 = 5,161.49 : x
2. Step 2: Convert to fraction form
   9,140.48/12,613.76 = 5,161.49/x
3. Step 3: Cross multiply
   9,140.48x = 12,613.76 × 5,161.49
4. Step 4: Simplify right side
   9,140.48x = 65,105,796.10
5. Step 5: Solve for x
   x = 65,105,796.10/9,140.48
6. Step 6: Final answer
   x = 7,122.80