Finding the Fourth Proportional to 42.50, 63.71 and 19.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42.50 : 63.71 = 19.67 : x
2. Step 2: Convert to fraction form
   42.50/63.71 = 19.67/x
3. Step 3: Cross multiply
   42.50x = 63.71 × 19.67
4. Step 4: Simplify right side
   42.50x = 1,252.83
5. Step 5: Solve for x
   x = 1,252.83/42.50
6. Step 6: Final answer
   x = 29.48