Finding the Fourth Proportional to 21,554.38, 29,747.82 and 12,123.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,554.38 : 29,747.82 = 12,123.10 : x
2. Step 2: Convert to fraction form
   21,554.38/29,747.82 = 12,123.10/x
3. Step 3: Cross multiply
   21,554.38x = 29,747.82 × 12,123.10
4. Step 4: Simplify right side
   21,554.38x = 360,635,796.64
5. Step 5: Solve for x
   x = 360,635,796.64/21,554.38
6. Step 6: Final answer
   x = 16,731.44