Finding the Fourth Proportional to 111.06, 153.18 and 83.43

Step by Step Solution

1. Step 1: Write the proportion equation
   111.06 : 153.18 = 83.43 : x
2. Step 2: Convert to fraction form
   111.06/153.18 = 83.43/x
3. Step 3: Cross multiply
   111.06x = 153.18 × 83.43
4. Step 4: Simplify right side
   111.06x = 12,779.81
5. Step 5: Solve for x
   x = 12,779.81/111.06
6. Step 6: Final answer
   x = 115.07