Finding the Fourth Proportional to 21,105.34, 29,123.40 and 11,673.70

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.34 : 29,123.40 = 11,673.70 : x
2. Step 2: Convert to fraction form
   21,105.34/29,123.40 = 11,673.70/x
3. Step 3: Cross multiply
   21,105.34x = 29,123.40 × 11,673.70
4. Step 4: Simplify right side
   21,105.34x = 339,977,834.58
5. Step 5: Solve for x
   x = 339,977,834.58/21,105.34
6. Step 6: Final answer
   x = 16,108.62