Finding the Fourth Proportional to 111.51, 152.96 and 105.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111.51 : 152.96 = 105.30 : x
2. Step 2: Convert to fraction form
   111.51/152.96 = 105.30/x
3. Step 3: Cross multiply
   111.51x = 152.96 × 105.30
4. Step 4: Simplify right side
   111.51x = 16,106.16
5. Step 5: Solve for x
   x = 16,106.16/111.51
6. Step 6: Final answer
   x = 144.44