Finding the Fourth Proportional to 12,686.72, 17,509.04 and 7,384.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.72 : 17,509.04 = 7,384.46 : x
2. Step 2: Convert to fraction form
   12,686.72/17,509.04 = 7,384.46/x
3. Step 3: Cross multiply
   12,686.72x = 17,509.04 × 7,384.46
4. Step 4: Simplify right side
   12,686.72x = 129,294,681.05
5. Step 5: Solve for x
   x = 129,294,681.05/12,686.72
6. Step 6: Final answer
   x = 10,191.34