Finding the Fourth Proportional to 61.91, 85.41 and 42.24

Step by Step Solution

1. Step 1: Write the proportion equation
   61.91 : 85.41 = 42.24 : x
2. Step 2: Convert to fraction form
   61.91/85.41 = 42.24/x
3. Step 3: Cross multiply
   61.91x = 85.41 × 42.24
4. Step 4: Simplify right side
   61.91x = 3,607.72
5. Step 5: Solve for x
   x = 3,607.72/61.91
6. Step 6: Final answer
   x = 58.27