Finding the Fourth Proportional to 21,581.54, 29,782.56 and 12,021.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,581.54 : 29,782.56 = 12,021.34 : x
2. Step 2: Convert to fraction form
   21,581.54/29,782.56 = 12,021.34/x
3. Step 3: Cross multiply
   21,581.54x = 29,782.56 × 12,021.34
4. Step 4: Simplify right side
   21,581.54x = 358,026,279.83
5. Step 5: Solve for x
   x = 358,026,279.83/21,581.54
6. Step 6: Final answer
   x = 16,589.47