Finding the Fourth Proportional to 73.78, 101.82 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   73.78 : 101.82 = 42.71 : x
2. Step 2: Convert to fraction form
   73.78/101.82 = 42.71/x
3. Step 3: Cross multiply
   73.78x = 101.82 × 42.71
4. Step 4: Simplify right side
   73.78x = 4,348.22
5. Step 5: Solve for x
   x = 4,348.22/73.78
6. Step 6: Final answer
   x = 58.94