Finding the Fourth Proportional to 109.98, 151.63 and 80.82

Step by Step Solution

1. Step 1: Write the proportion equation
   109.98 : 151.63 = 80.82 : x
2. Step 2: Convert to fraction form
   109.98/151.63 = 80.82/x
3. Step 3: Cross multiply
   109.98x = 151.63 × 80.82
4. Step 4: Simplify right side
   109.98x = 12,254.53
5. Step 5: Solve for x
   x = 12,254.53/109.98
6. Step 6: Final answer
   x = 111.43