Finding the Fourth Proportional to 112.72, 168.43 and 83.32

Step by Step Solution

1. Step 1: Write the proportion equation
   112.72 : 168.43 = 83.32 : x
2. Step 2: Convert to fraction form
   112.72/168.43 = 83.32/x
3. Step 3: Cross multiply
   112.72x = 168.43 × 83.32
4. Step 4: Simplify right side
   112.72x = 14,032.33
5. Step 5: Solve for x
   x = 14,032.33/112.72
6. Step 6: Final answer
   x = 124.49