Finding the Fourth Proportional to 12,685.27, 17,509.20 and 7,381.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.27 : 17,509.20 = 7,381.12 : x
2. Step 2: Convert to fraction form
   12,685.27/17,509.20 = 7,381.12/x
3. Step 3: Cross multiply
   12,685.27x = 17,509.20 × 7,381.12
4. Step 4: Simplify right side
   12,685.27x = 129,237,381.85
5. Step 5: Solve for x
   x = 129,237,381.85/12,685.27
6. Step 6: Final answer
   x = 10,187.99