Finding the Fourth Proportional to 21,062.36, 31,602.72 and 12,297.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,062.36 : 31,602.72 = 12,297.28 : x
2. Step 2: Convert to fraction form
   21,062.36/31,602.72 = 12,297.28/x
3. Step 3: Cross multiply
   21,062.36x = 31,602.72 × 12,297.28
4. Step 4: Simplify right side
   21,062.36x = 388,627,496.60
5. Step 5: Solve for x
   x = 388,627,496.60/21,062.36
6. Step 6: Final answer
   x = 18,451.28