Finding the Fourth Proportional to 21,581.89, 29,799.89 and 16,879.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.89 : 29,799.89 = 16,879.57 : x
2. Step 2: Convert to fraction form
   21,581.89/29,799.89 = 16,879.57/x
3. Step 3: Cross multiply
   21,581.89x = 29,799.89 × 16,879.57
4. Step 4: Simplify right side
   21,581.89x = 503,009,222.45
5. Step 5: Solve for x
   x = 503,009,222.45/21,581.89
6. Step 6: Final answer
   x = 23,307.01