Finding the Fourth Proportional to 112.10, 154.56 and 91.30

Step by Step Solution

1. Step 1: Write the proportion equation
   112.10 : 154.56 = 91.30 : x
2. Step 2: Convert to fraction form
   112.10/154.56 = 91.30/x
3. Step 3: Cross multiply
   112.10x = 154.56 × 91.30
4. Step 4: Simplify right side
   112.10x = 14,111.33
5. Step 5: Solve for x
   x = 14,111.33/112.10
6. Step 6: Final answer
   x = 125.88