Finding the Fourth Proportional to 42.84, 64.27 and 15.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42.84 : 64.27 = 15.79 : x
2. Step 2: Convert to fraction form
   42.84/64.27 = 15.79/x
3. Step 3: Cross multiply
   42.84x = 64.27 × 15.79
4. Step 4: Simplify right side
   42.84x = 1,014.82
5. Step 5: Solve for x
   x = 1,014.82/42.84
6. Step 6: Final answer
   x = 23.69