Finding the Fourth Proportional to 42.98, 64.42 and 16.94

Step by Step Solution

1. Step 1: Write the proportion equation
   42.98 : 64.42 = 16.94 : x
2. Step 2: Convert to fraction form
   42.98/64.42 = 16.94/x
3. Step 3: Cross multiply
   42.98x = 64.42 × 16.94
4. Step 4: Simplify right side
   42.98x = 1,091.27
5. Step 5: Solve for x
   x = 1,091.27/42.98
6. Step 6: Final answer
   x = 25.39