Finding the Fourth Proportional to 91.82, 137.73 and 72.69

Step by Step Solution

1. Step 1: Write the proportion equation
   91.82 : 137.73 = 72.69 : x
2. Step 2: Convert to fraction form
   91.82/137.73 = 72.69/x
3. Step 3: Cross multiply
   91.82x = 137.73 × 72.69
4. Step 4: Simplify right side
   91.82x = 10,011.59
5. Step 5: Solve for x
   x = 10,011.59/91.82
6. Step 6: Final answer
   x = 109.04