Finding the Fourth Proportional to 12,382.16, 17,067.72 and 12,136.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,382.16 : 17,067.72 = 12,136.40 : x
2. Step 2: Convert to fraction form
   12,382.16/17,067.72 = 12,136.40/x
3. Step 3: Cross multiply
   12,382.16x = 17,067.72 × 12,136.40
4. Step 4: Simplify right side
   12,382.16x = 207,140,677.01
5. Step 5: Solve for x
   x = 207,140,677.01/12,382.16
6. Step 6: Final answer
   x = 16,728.96