Finding the Fourth Proportional to 12,665.28, 17,475.12 and 7,628.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.28 : 17,475.12 = 7,628.16 : x
2. Step 2: Convert to fraction form
   12,665.28/17,475.12 = 7,628.16/x
3. Step 3: Cross multiply
   12,665.28x = 17,475.12 × 7,628.16
4. Step 4: Simplify right side
   12,665.28x = 133,303,011.38
5. Step 5: Solve for x
   x = 133,303,011.38/12,665.28
6. Step 6: Final answer
   x = 10,525.07