Finding the Fourth Proportional to 69.27, 103.90 and 42.21

Step by Step Solution

1. Step 1: Write the proportion equation
   69.27 : 103.90 = 42.21 : x
2. Step 2: Convert to fraction form
   69.27/103.90 = 42.21/x
3. Step 3: Cross multiply
   69.27x = 103.90 × 42.21
4. Step 4: Simplify right side
   69.27x = 4,384.89
5. Step 5: Solve for x
   x = 4,384.89/69.27
6. Step 6: Final answer
   x = 63.31