Finding the Fourth Proportional to 111.06, 153.06 and 78.26

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 153.06 = 78.26 : x
2. Step 2: Convert to fraction form
   111.06/153.06 = 78.26/x
3. Step 3: Cross multiply
   111.06x = 153.06 × 78.26
4. Step 4: Simplify right side
   111.06x = 11,978.48
5. Step 5: Solve for x
   x = 11,978.48/111.06
6. Step 6: Final answer
   x = 107.86