Finding the Fourth Proportional to 111.06, 153.15 and 79.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 153.15 = 79.98 : x
2. Step 2: Convert to fraction form
   111.06/153.15 = 79.98/x
3. Step 3: Cross multiply
   111.06x = 153.15 × 79.98
4. Step 4: Simplify right side
   111.06x = 12,248.94
5. Step 5: Solve for x
   x = 12,248.94/111.06
6. Step 6: Final answer
   x = 110.29