Finding the Fourth Proportional to 42,456.72, 63,685 and 11,291.97

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.72 : 63,685 = 11,291.97 : x
2. Step 2: Convert to fraction form
   42,456.72/63,685 = 11,291.97/x
3. Step 3: Cross multiply
   42,456.72x = 63,685 × 11,291.97
4. Step 4: Simplify right side
   42,456.72x = 719,129,109.45
5. Step 5: Solve for x
   x = 719,129,109.45/42,456.72
6. Step 6: Final answer
   x = 16,937.93