Finding the Fourth Proportional to 21,048.48, 31,570.56 and 13,233.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,048.48 : 31,570.56 = 13,233.60 : x
2. Step 2: Convert to fraction form
   21,048.48/31,570.56 = 13,233.60/x
3. Step 3: Cross multiply
   21,048.48x = 31,570.56 × 13,233.60
4. Step 4: Simplify right side
   21,048.48x = 417,792,162.82
5. Step 5: Solve for x
   x = 417,792,162.82/21,048.48
6. Step 6: Final answer
   x = 19,849.04