Finding the Fourth Proportional to 112.59, 155.52 and 83.61

Step by Step Solution

1. Step 1: Write the proportion equation
   112.59 : 155.52 = 83.61 : x
2. Step 2: Convert to fraction form
   112.59/155.52 = 83.61/x
3. Step 3: Cross multiply
   112.59x = 155.52 × 83.61
4. Step 4: Simplify right side
   112.59x = 13,003.03
5. Step 5: Solve for x
   x = 13,003.03/112.59
6. Step 6: Final answer
   x = 115.49