Finding the Fourth Proportional to 111.09, 153.25 and 78.36

Step by Step Solution

1. Step 1: Write the proportion equation
   111.09 : 153.25 = 78.36 : x
2. Step 2: Convert to fraction form
   111.09/153.25 = 78.36/x
3. Step 3: Cross multiply
   111.09x = 153.25 × 78.36
4. Step 4: Simplify right side
   111.09x = 12,008.67
5. Step 5: Solve for x
   x = 12,008.67/111.09
6. Step 6: Final answer
   x = 108.10