Finding the Fourth Proportional to 12,180.30, 16,812.41 and 7,145.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,180.30 : 16,812.41 = 7,145.61 : x
2. Step 2: Convert to fraction form
   12,180.30/16,812.41 = 7,145.61/x
3. Step 3: Cross multiply
   12,180.30x = 16,812.41 × 7,145.61
4. Step 4: Simplify right side
   12,180.30x = 120,134,889.29
5. Step 5: Solve for x
   x = 120,134,889.29/12,180.30
6. Step 6: Final answer
   x = 9,863.05