Finding the Fourth Proportional to 111.31, 153.46 and 76.28

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 153.46 = 76.28 : x
2. Step 2: Convert to fraction form
   111.31/153.46 = 76.28/x
3. Step 3: Cross multiply
   111.31x = 153.46 × 76.28
4. Step 4: Simplify right side
   111.31x = 11,705.51
5. Step 5: Solve for x
   x = 11,705.51/111.31
6. Step 6: Final answer
   x = 105.16