Finding the Fourth Proportional to 21,021, 29,009.34 and 13,581.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021 : 29,009.34 = 13,581.96 : x
2. Step 2: Convert to fraction form
   21,021/29,009.34 = 13,581.96/x
3. Step 3: Cross multiply
   21,021x = 29,009.34 × 13,581.96
4. Step 4: Simplify right side
   21,021x = 394,003,695.51
5. Step 5: Solve for x
   x = 394,003,695.51/21,021
6. Step 6: Final answer
   x = 18,743.34