Finding the Fourth Proportional to 112.30, 155.16 and 111.50

Step by Step Solution

1. Step 1: Write the proportion equation
   112.30 : 155.16 = 111.50 : x
2. Step 2: Convert to fraction form
   112.30/155.16 = 111.50/x
3. Step 3: Cross multiply
   112.30x = 155.16 × 111.50
4. Step 4: Simplify right side
   112.30x = 17,300.34
5. Step 5: Solve for x
   x = 17,300.34/112.30
6. Step 6: Final answer
   x = 154.05