Finding the Fourth Proportional to 9,318.72, 12,859.92 and 5,127.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,318.72 : 12,859.92 = 5,127.12 : x
2. Step 2: Convert to fraction form
   9,318.72/12,859.92 = 5,127.12/x
3. Step 3: Cross multiply
   9,318.72x = 12,859.92 × 5,127.12
4. Step 4: Simplify right side
   9,318.72x = 65,934,353.03
5. Step 5: Solve for x
   x = 65,934,353.03/9,318.72
6. Step 6: Final answer
   x = 7,075.47