Finding the Fourth Proportional to 61.42, 91.96 and 42.12

Step by Step Solution

1. Step 1: Write the proportion equation
   61.42 : 91.96 = 42.12 : x
2. Step 2: Convert to fraction form
   61.42/91.96 = 42.12/x
3. Step 3: Cross multiply
   61.42x = 91.96 × 42.12
4. Step 4: Simplify right side
   61.42x = 3,873.36
5. Step 5: Solve for x
   x = 3,873.36/61.42
6. Step 6: Final answer
   x = 63.06