Finding the Fourth Proportional to 13,881.38, 19,139.55 and 9,636.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,881.38 : 19,139.55 = 9,636.05 : x
2. Step 2: Convert to fraction form
   13,881.38/19,139.55 = 9,636.05/x
3. Step 3: Cross multiply
   13,881.38x = 19,139.55 × 9,636.05
4. Step 4: Simplify right side
   13,881.38x = 184,429,660.78
5. Step 5: Solve for x
   x = 184,429,660.78/13,881.38
6. Step 6: Final answer
   x = 13,286.12