Finding the Fourth Proportional to 112.89, 155.79 and 69.20

Step by Step Solution

1. Step 1: Write the proportion equation
   112.89 : 155.79 = 69.20 : x
2. Step 2: Convert to fraction form
   112.89/155.79 = 69.20/x
3. Step 3: Cross multiply
   112.89x = 155.79 × 69.20
4. Step 4: Simplify right side
   112.89x = 10,779.89
5. Step 5: Solve for x
   x = 10,779.89/112.89
6. Step 6: Final answer
   x = 95.49