Finding the Fourth Proportional to 111.01, 153.20 and 78.27

Step by Step Solution

1. Step 1: Write the proportion equation
   111.01 : 153.20 = 78.27 : x
2. Step 2: Convert to fraction form
   111.01/153.20 = 78.27/x
3. Step 3: Cross multiply
   111.01x = 153.20 × 78.27
4. Step 4: Simplify right side
   111.01x = 11,989.81
5. Step 5: Solve for x
   x = 11,989.81/111.01
6. Step 6: Final answer
   x = 108.01