Finding the Fourth Proportional to 12,185.42, 16,815.74 and 7,148.66

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.42 : 16,815.74 = 7,148.66 : x
2. Step 2: Convert to fraction form
   12,185.42/16,815.74 = 7,148.66/x
3. Step 3: Cross multiply
   12,185.42x = 16,815.74 × 7,148.66
4. Step 4: Simplify right side
   12,185.42x = 120,210,007.91
5. Step 5: Solve for x
   x = 120,210,007.91/12,185.42
6. Step 6: Final answer
   x = 9,865.07