Finding the Fourth Proportional to 111.22, 153.42 and 90.52

Step by Step Solution

1. Step 1: Write the proportion equation
   111.22 : 153.42 = 90.52 : x
2. Step 2: Convert to fraction form
   111.22/153.42 = 90.52/x
3. Step 3: Cross multiply
   111.22x = 153.42 × 90.52
4. Step 4: Simplify right side
   111.22x = 13,887.58
5. Step 5: Solve for x
   x = 13,887.58/111.22
6. Step 6: Final answer
   x = 124.87