Finding the Fourth Proportional to 21,123.67, 29,084.21 and 17,930.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.67 : 29,084.21 = 17,930.30 : x
2. Step 2: Convert to fraction form
   21,123.67/29,084.21 = 17,930.30/x
3. Step 3: Cross multiply
   21,123.67x = 29,084.21 × 17,930.30
4. Step 4: Simplify right side
   21,123.67x = 521,488,543.59
5. Step 5: Solve for x
   x = 521,488,543.59/21,123.67
6. Step 6: Final answer
   x = 24,687.40