Finding the Fourth Proportional to 12,181.46, 16,813.91 and 7,145.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,181.46 : 16,813.91 = 7,145.89 : x
2. Step 2: Convert to fraction form
   12,181.46/16,813.91 = 7,145.89/x
3. Step 3: Cross multiply
   12,181.46x = 16,813.91 × 7,145.89
4. Step 4: Simplify right side
   12,181.46x = 120,150,327.16
5. Step 5: Solve for x
   x = 120,150,327.16/12,181.46
6. Step 6: Final answer
   x = 9,863.38