Finding the Fourth Proportional to 91.72, 137.38 and 82.82

Step by Step Solution

1. Step 1: Write the proportion equation
   91.72 : 137.38 = 82.82 : x
2. Step 2: Convert to fraction form
   91.72/137.38 = 82.82/x
3. Step 3: Cross multiply
   91.72x = 137.38 × 82.82
4. Step 4: Simplify right side
   91.72x = 11,377.81
5. Step 5: Solve for x
   x = 11,377.81/91.72
6. Step 6: Final answer
   x = 124.05