Finding the Fourth Proportional to 48.91, 67.50 and 42.79

Step by Step Solution

1. Step 1: Write the proportion equation
   48.91 : 67.50 = 42.79 : x
2. Step 2: Convert to fraction form
   48.91/67.50 = 42.79/x
3. Step 3: Cross multiply
   48.91x = 67.50 × 42.79
4. Step 4: Simplify right side
   48.91x = 2,888.33
5. Step 5: Solve for x
   x = 2,888.33/48.91
6. Step 6: Final answer
   x = 59.05