Finding the Fourth Proportional to 42.94, 64.43 and 15.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42.94 : 64.43 = 15.88 : x
2. Step 2: Convert to fraction form
   42.94/64.43 = 15.88/x
3. Step 3: Cross multiply
   42.94x = 64.43 × 15.88
4. Step 4: Simplify right side
   42.94x = 1,022.91
5. Step 5: Solve for x
   x = 1,022.91/42.94
6. Step 6: Final answer
   x = 23.82