Finding the Fourth Proportional to 111.83, 154.15 and 91.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.83 : 154.15 = 91.10 : x
2. Step 2: Convert to fraction form
   111.83/154.15 = 91.10/x
3. Step 3: Cross multiply
   111.83x = 154.15 × 91.10
4. Step 4: Simplify right side
   111.83x = 14,043.22
5. Step 5: Solve for x
   x = 14,043.22/111.83
6. Step 6: Final answer
   x = 125.58