Finding the Fourth Proportional to 9,150.87, 12,628.04 and 5,171.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,150.87 : 12,628.04 = 5,171.91 : x
2. Step 2: Convert to fraction form
   9,150.87/12,628.04 = 5,171.91/x
3. Step 3: Cross multiply
   9,150.87x = 12,628.04 × 5,171.91
4. Step 4: Simplify right side
   9,150.87x = 65,311,086.36
5. Step 5: Solve for x
   x = 65,311,086.36/9,150.87
6. Step 6: Final answer
   x = 7,137.15