Finding the Fourth Proportional to 111.58, 153.82 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   111.58 : 153.82 = 90.82 : x
2. Step 2: Convert to fraction form
   111.58/153.82 = 90.82/x
3. Step 3: Cross multiply
   111.58x = 153.82 × 90.82
4. Step 4: Simplify right side
   111.58x = 13,969.93
5. Step 5: Solve for x
   x = 13,969.93/111.58
6. Step 6: Final answer
   x = 125.21