Finding the Fourth Proportional to 12,181.83, 16,767.59 and 8,638.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,181.83 : 16,767.59 = 8,638.89 : x
2. Step 2: Convert to fraction form
   12,181.83/16,767.59 = 8,638.89/x
3. Step 3: Cross multiply
   12,181.83x = 16,767.59 × 8,638.89
4. Step 4: Simplify right side
   12,181.83x = 144,853,322.38
5. Step 5: Solve for x
   x = 144,853,322.38/12,181.83
6. Step 6: Final answer
   x = 11,890.93