Finding the Fourth Proportional to 69.21, 103.83 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   69.21 : 103.83 = 42.15 : x
2. Step 2: Convert to fraction form
   69.21/103.83 = 42.15/x
3. Step 3: Cross multiply
   69.21x = 103.83 × 42.15
4. Step 4: Simplify right side
   69.21x = 4,376.43
5. Step 5: Solve for x
   x = 4,376.43/69.21
6. Step 6: Final answer
   x = 63.23