Finding the Fourth Proportional to 12,129.15, 18,185.61 and 9,792.03

Step by Step Solution

1. Step 1: Write the proportion equation
   12,129.15 : 18,185.61 = 9,792.03 : x
2. Step 2: Convert to fraction form
   12,129.15/18,185.61 = 9,792.03/x
3. Step 3: Cross multiply
   12,129.15x = 18,185.61 × 9,792.03
4. Step 4: Simplify right side
   12,129.15x = 178,074,038.69
5. Step 5: Solve for x
   x = 178,074,038.69/12,129.15
6. Step 6: Final answer
   x = 14,681.49