Finding the Fourth Proportional to 21,022.20, 29,009.54 and 13,064.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.20 : 29,009.54 = 13,064.25 : x
2. Step 2: Convert to fraction form
   21,022.20/29,009.54 = 13,064.25/x
3. Step 3: Cross multiply
   21,022.20x = 29,009.54 × 13,064.25
4. Step 4: Simplify right side
   21,022.20x = 378,988,024.39
5. Step 5: Solve for x
   x = 378,988,024.39/21,022.20
6. Step 6: Final answer
   x = 18,027.99