Finding the Fourth Proportional to 81.69, 112.72 and 48.98

Step by Step Solution

1. Step 1: Write the proportion equation
   81.69 : 112.72 = 48.98 : x
2. Step 2: Convert to fraction form
   81.69/112.72 = 48.98/x
3. Step 3: Cross multiply
   81.69x = 112.72 × 48.98
4. Step 4: Simplify right side
   81.69x = 5,521.03
5. Step 5: Solve for x
   x = 5,521.03/81.69
6. Step 6: Final answer
   x = 67.59