Finding the Fourth Proportional to 42,689.28, 64,016.64 and 18,048

Step by Step Solution

1. Step 1: Write the proportion equation
   42,689.28 : 64,016.64 = 18,048 : x
2. Step 2: Convert to fraction form
   42,689.28/64,016.64 = 18,048/x
3. Step 3: Cross multiply
   42,689.28x = 64,016.64 × 18,048
4. Step 4: Simplify right side
   42,689.28x = 1,155,372,318.72
5. Step 5: Solve for x
   x = 1,155,372,318.72/42,689.28
6. Step 6: Final answer
   x = 27,064.69