Finding the Fourth Proportional to 112.86, 155.94 and 88.50

Step by Step Solution

1. Step 1: Write the proportion equation
   112.86 : 155.94 = 88.50 : x
2. Step 2: Convert to fraction form
   112.86/155.94 = 88.50/x
3. Step 3: Cross multiply
   112.86x = 155.94 × 88.50
4. Step 4: Simplify right side
   112.86x = 13,800.69
5. Step 5: Solve for x
   x = 13,800.69/112.86
6. Step 6: Final answer
   x = 122.28