Finding the Fourth Proportional to 9,151.89, 12,629.55 and 5,173.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,151.89 : 12,629.55 = 5,173.80 : x
2. Step 2: Convert to fraction form
   9,151.89/12,629.55 = 5,173.80/x
3. Step 3: Cross multiply
   9,151.89x = 12,629.55 × 5,173.80
4. Step 4: Simplify right side
   9,151.89x = 65,342,765.79
5. Step 5: Solve for x
   x = 65,342,765.79/9,151.89
6. Step 6: Final answer
   x = 7,139.81