Finding the Fourth Proportional to 112.76, 155.72 and 69.12

Step by Step Solution

1. Step 1: Write the proportion equation
   112.76 : 155.72 = 69.12 : x
2. Step 2: Convert to fraction form
   112.76/155.72 = 69.12/x
3. Step 3: Cross multiply
   112.76x = 155.72 × 69.12
4. Step 4: Simplify right side
   112.76x = 10,763.02
5. Step 5: Solve for x
   x = 10,763.02/112.76
6. Step 6: Final answer
   x = 95.45