Finding the Fourth Proportional to 13,109.83, 19,667.17 and 11,921.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.83 : 19,667.17 = 11,921.42 : x
2. Step 2: Convert to fraction form
   13,109.83/19,667.17 = 11,921.42/x
3. Step 3: Cross multiply
   13,109.83x = 19,667.17 × 11,921.42
4. Step 4: Simplify right side
   13,109.83x = 234,460,593.78
5. Step 5: Solve for x
   x = 234,460,593.78/13,109.83
6. Step 6: Final answer
   x = 17,884.34