Finding the Fourth Proportional to 69.12, 103.71 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   69.12 : 103.71 = 42.09 : x
2. Step 2: Convert to fraction form
   69.12/103.71 = 42.09/x
3. Step 3: Cross multiply
   69.12x = 103.71 × 42.09
4. Step 4: Simplify right side
   69.12x = 4,365.15
5. Step 5: Solve for x
   x = 4,365.15/69.12
6. Step 6: Final answer
   x = 63.15