Finding the Fourth Proportional to 7,131.68, 10,686.24 and 5,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.68 : 10,686.24 = 5,174.72 : x
2. Step 2: Convert to fraction form
   7,131.68/10,686.24 = 5,174.72/x
3. Step 3: Cross multiply
   7,131.68x = 10,686.24 × 5,174.72
4. Step 4: Simplify right side
   7,131.68x = 55,298,299.85
5. Step 5: Solve for x
   x = 55,298,299.85/7,131.68
6. Step 6: Final answer
   x = 7,753.90