Finding the Fourth Proportional to 21,019.29, 29,005.56 and 13,061.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.29 : 29,005.56 = 13,061.34 : x
2. Step 2: Convert to fraction form
   21,019.29/29,005.56 = 13,061.34/x
3. Step 3: Cross multiply
   21,019.29x = 29,005.56 × 13,061.34
4. Step 4: Simplify right side
   21,019.29x = 378,851,481.05
5. Step 5: Solve for x
   x = 378,851,481.05/21,019.29
6. Step 6: Final answer
   x = 18,023.99