Finding the Fourth Proportional to 69.39, 104.15 and 42.39

Step by Step Solution

1. Step 1: Write the proportion equation
   69.39 : 104.15 = 42.39 : x
2. Step 2: Convert to fraction form
   69.39/104.15 = 42.39/x
3. Step 3: Cross multiply
   69.39x = 104.15 × 42.39
4. Step 4: Simplify right side
   69.39x = 4,414.92
5. Step 5: Solve for x
   x = 4,414.92/69.39
6. Step 6: Final answer
   x = 63.62