Finding the Fourth Proportional to 112.56, 168.72 and 74.09

Step by Step Solution

1. Step 1: Write the proportion equation
   112.56 : 168.72 = 74.09 : x
2. Step 2: Convert to fraction form
   112.56/168.72 = 74.09/x
3. Step 3: Cross multiply
   112.56x = 168.72 × 74.09
4. Step 4: Simplify right side
   112.56x = 12,499.62
5. Step 5: Solve for x
   x = 12,499.62/112.56
6. Step 6: Final answer
   x = 111.05