Finding the Fourth Proportional to 137.25, 189.42 and 111.15

Step by Step Solution

1. Step 1: Write the proportion equation
   137.25 : 189.42 = 111.15 : x
2. Step 2: Convert to fraction form
   137.25/189.42 = 111.15/x
3. Step 3: Cross multiply
   137.25x = 189.42 × 111.15
4. Step 4: Simplify right side
   137.25x = 21,054.03
5. Step 5: Solve for x
   x = 21,054.03/137.25
6. Step 6: Final answer
   x = 153.40