Finding the Fourth Proportional to 112.42, 168.72 and 61.03

Step by Step Solution

1. Step 1: Write the proportion equation
   112.42 : 168.72 = 61.03 : x
2. Step 2: Convert to fraction form
   112.42/168.72 = 61.03/x
3. Step 3: Cross multiply
   112.42x = 168.72 × 61.03
4. Step 4: Simplify right side
   112.42x = 10,296.98
5. Step 5: Solve for x
   x = 10,296.98/112.42
6. Step 6: Final answer
   x = 91.59