Finding the Fourth Proportional to 111.10, 153.02 and 90.34

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 153.02 = 90.34 : x
2. Step 2: Convert to fraction form
   111.10/153.02 = 90.34/x
3. Step 3: Cross multiply
   111.10x = 153.02 × 90.34
4. Step 4: Simplify right side
   111.10x = 13,823.83
5. Step 5: Solve for x
   x = 13,823.83/111.10
6. Step 6: Final answer
   x = 124.43