Finding the Fourth Proportional to 7,145.52, 10,667.94 and 6,171.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,145.52 : 10,667.94 = 6,171.12 : x
2. Step 2: Convert to fraction form
   7,145.52/10,667.94 = 6,171.12/x
3. Step 3: Cross multiply
   7,145.52x = 10,667.94 × 6,171.12
4. Step 4: Simplify right side
   7,145.52x = 65,833,137.89
5. Step 5: Solve for x
   x = 65,833,137.89/7,145.52
6. Step 6: Final answer
   x = 9,213.20