Finding the Fourth Proportional to 91.72, 137.49 and 82.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91.72 : 137.49 = 82.72 : x
2. Step 2: Convert to fraction form
   91.72/137.49 = 82.72/x
3. Step 3: Cross multiply
   91.72x = 137.49 × 82.72
4. Step 4: Simplify right side
   91.72x = 11,373.17
5. Step 5: Solve for x
   x = 11,373.17/91.72
6. Step 6: Final answer
   x = 124.00