Finding the Fourth Proportional to 7,123.12, 10,669.28 and 5,171.04

Step by Step Solution

1. Step 1: Write the proportion equation
   7,123.12 : 10,669.28 = 5,171.04 : x
2. Step 2: Convert to fraction form
   7,123.12/10,669.28 = 5,171.04/x
3. Step 3: Cross multiply
   7,123.12x = 10,669.28 × 5,171.04
4. Step 4: Simplify right side
   7,123.12x = 55,171,273.65
5. Step 5: Solve for x
   x = 55,171,273.65/7,123.12
6. Step 6: Final answer
   x = 7,745.38