Finding the Fourth Proportional to 112.39, 168.63 and 61.05

Step by Step Solution

1. Step 1: Write the proportion equation
   112.39 : 168.63 = 61.05 : x
2. Step 2: Convert to fraction form
   112.39/168.63 = 61.05/x
3. Step 3: Cross multiply
   112.39x = 168.63 × 61.05
4. Step 4: Simplify right side
   112.39x = 10,295.61
5. Step 5: Solve for x
   x = 10,295.61/112.39
6. Step 6: Final answer
   x = 91.61