Finding the Fourth Proportional to 21,287.29, 29,405.15 and 19,300.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,287.29 : 29,405.15 = 19,300.09 : x
2. Step 2: Convert to fraction form
   21,287.29/29,405.15 = 19,300.09/x
3. Step 3: Cross multiply
   21,287.29x = 29,405.15 × 19,300.09
4. Step 4: Simplify right side
   21,287.29x = 567,521,944.96
5. Step 5: Solve for x
   x = 567,521,944.96/21,287.29
6. Step 6: Final answer
   x = 26,660.13