Finding the Fourth Proportional to 21,100.38, 29,106.96 and 13,538.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.38 : 29,106.96 = 13,538.28 : x
2. Step 2: Convert to fraction form
   21,100.38/29,106.96 = 13,538.28/x
3. Step 3: Cross multiply
   21,100.38x = 29,106.96 × 13,538.28
4. Step 4: Simplify right side
   21,100.38x = 394,058,174.43
5. Step 5: Solve for x
   x = 394,058,174.43/21,100.38
6. Step 6: Final answer
   x = 18,675.41