Finding the Fourth Proportional to 112.46, 168.72 and 61.12

Step by Step Solution

1. Step 1: Write the proportion equation
   112.46 : 168.72 = 61.12 : x
2. Step 2: Convert to fraction form
   112.46/168.72 = 61.12/x
3. Step 3: Cross multiply
   112.46x = 168.72 × 61.12
4. Step 4: Simplify right side
   112.46x = 10,312.15
5. Step 5: Solve for x
   x = 10,312.15/112.46
6. Step 6: Final answer
   x = 91.70