Finding the Fourth Proportional to 49.10, 67.86 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   49.10 : 67.86 = 42.20 : x
2. Step 2: Convert to fraction form
   49.10/67.86 = 42.20/x
3. Step 3: Cross multiply
   49.10x = 67.86 × 42.20
4. Step 4: Simplify right side
   49.10x = 2,863.69
5. Step 5: Solve for x
   x = 2,863.69/49.10
6. Step 6: Final answer
   x = 58.32