Finding the Fourth Proportional to 48.18, 71.91 and 42.09

Step by Step Solution

1. Step 1: Write the proportion equation
   48.18 : 71.91 = 42.09 : x
2. Step 2: Convert to fraction form
   48.18/71.91 = 42.09/x
3. Step 3: Cross multiply
   48.18x = 71.91 × 42.09
4. Step 4: Simplify right side
   48.18x = 3,026.69
5. Step 5: Solve for x
   x = 3,026.69/48.18
6. Step 6: Final answer
   x = 62.82