Finding the Fourth Proportional to 42.78, 58.86 and 35.46

Step by Step Solution

1. Step 1: Write the proportion equation
   42.78 : 58.86 = 35.46 : x
2. Step 2: Convert to fraction form
   42.78/58.86 = 35.46/x
3. Step 3: Cross multiply
   42.78x = 58.86 × 35.46
4. Step 4: Simplify right side
   42.78x = 2,087.18
5. Step 5: Solve for x
   x = 2,087.18/42.78
6. Step 6: Final answer
   x = 48.79