Finding the Fourth Proportional to 21,621.26, 29,837.30 and 12,189.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,621.26 : 29,837.30 = 12,189.83 : x
2. Step 2: Convert to fraction form
   21,621.26/29,837.30 = 12,189.83/x
3. Step 3: Cross multiply
   21,621.26x = 29,837.30 × 12,189.83
4. Step 4: Simplify right side
   21,621.26x = 363,711,404.52
5. Step 5: Solve for x
   x = 363,711,404.52/21,621.26
6. Step 6: Final answer
   x = 16,821.94