Finding the Fourth Proportional to 21,300.33, 29,399.46 and 13,240.07

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.33 : 29,399.46 = 13,240.07 : x
2. Step 2: Convert to fraction form
   21,300.33/29,399.46 = 13,240.07/x
3. Step 3: Cross multiply
   21,300.33x = 29,399.46 × 13,240.07
4. Step 4: Simplify right side
   21,300.33x = 389,250,908.36
5. Step 5: Solve for x
   x = 389,250,908.36/21,300.33
6. Step 6: Final answer
   x = 18,274.41