Finding the Fourth Proportional to 43,228.49, 64,846.37 and 13,638.38

Step by Step Solution

1. Step 1: Write the proportion equation
   43,228.49 : 64,846.37 = 13,638.38 : x
2. Step 2: Convert to fraction form
   43,228.49/64,846.37 = 13,638.38/x
3. Step 3: Cross multiply
   43,228.49x = 64,846.37 × 13,638.38
4. Step 4: Simplify right side
   43,228.49x = 884,399,145.54
5. Step 5: Solve for x
   x = 884,399,145.54/43,228.49
6. Step 6: Final answer
   x = 20,458.71