Finding the Fourth Proportional to 42,456.28, 63,687.66 and 11,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.28 : 63,687.66 = 11,290.72 : x
2. Step 2: Convert to fraction form
   42,456.28/63,687.66 = 11,290.72/x
3. Step 3: Cross multiply
   42,456.28x = 63,687.66 × 11,290.72
4. Step 4: Simplify right side
   42,456.28x = 719,079,536.52
5. Step 5: Solve for x
   x = 719,079,536.52/42,456.28
6. Step 6: Final answer
   x = 16,936.94