Finding the Fourth Proportional to 111.56, 153.93 and 82.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.93 = 82.10 : x
2. Step 2: Convert to fraction form
   111.56/153.93 = 82.10/x
3. Step 3: Cross multiply
   111.56x = 153.93 × 82.10
4. Step 4: Simplify right side
   111.56x = 12,637.65
5. Step 5: Solve for x
   x = 12,637.65/111.56
6. Step 6: Final answer
   x = 113.28