Finding the Fourth Proportional to 21,099.38, 29,103.42 and 13,533.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,099.38 : 29,103.42 = 13,533.72 : x
2. Step 2: Convert to fraction form
   21,099.38/29,103.42 = 13,533.72/x
3. Step 3: Cross multiply
   21,099.38x = 29,103.42 × 13,533.72
4. Step 4: Simplify right side
   21,099.38x = 393,877,537.32
5. Step 5: Solve for x
   x = 393,877,537.32/21,099.38
6. Step 6: Final answer
   x = 18,667.73