Finding the Fourth Proportional to 69.86, 104.63 and 42.73

Step by Step Solution

1. Step 1: Write the proportion equation
   69.86 : 104.63 = 42.73 : x
2. Step 2: Convert to fraction form
   69.86/104.63 = 42.73/x
3. Step 3: Cross multiply
   69.86x = 104.63 × 42.73
4. Step 4: Simplify right side
   69.86x = 4,470.36
5. Step 5: Solve for x
   x = 4,470.36/69.86
6. Step 6: Final answer
   x = 63.99