Finding the Fourth Proportional to 21,048.05, 31,533.77 and 12,256.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,048.05 : 31,533.77 = 12,256.31 : x
2. Step 2: Convert to fraction form
   21,048.05/31,533.77 = 12,256.31/x
3. Step 3: Cross multiply
   21,048.05x = 31,533.77 × 12,256.31
4. Step 4: Simplify right side
   21,048.05x = 386,487,441.64
5. Step 5: Solve for x
   x = 386,487,441.64/21,048.05
6. Step 6: Final answer
   x = 18,362.15