Finding the Fourth Proportional to 85.93, 128.69 and 42.46

Step by Step Solution

1. Step 1: Write the proportion equation
   85.93 : 128.69 = 42.46 : x
2. Step 2: Convert to fraction form
   85.93/128.69 = 42.46/x
3. Step 3: Cross multiply
   85.93x = 128.69 × 42.46
4. Step 4: Simplify right side
   85.93x = 5,464.18
5. Step 5: Solve for x
   x = 5,464.18/85.93
6. Step 6: Final answer
   x = 63.59