Finding the Fourth Proportional to 9,145.72, 12,621.04 and 5,168.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.72 : 12,621.04 = 5,168.12 : x
2. Step 2: Convert to fraction form
   9,145.72/12,621.04 = 5,168.12/x
3. Step 3: Cross multiply
   9,145.72x = 12,621.04 × 5,168.12
4. Step 4: Simplify right side
   9,145.72x = 65,227,049.24
5. Step 5: Solve for x
   x = 65,227,049.24/9,145.72
6. Step 6: Final answer
   x = 7,131.98