Finding the Fourth Proportional to 91.76, 137.46 and 71.37

Step by Step Solution

1. Step 1: Write the proportion equation
   91.76 : 137.46 = 71.37 : x
2. Step 2: Convert to fraction form
   91.76/137.46 = 71.37/x
3. Step 3: Cross multiply
   91.76x = 137.46 × 71.37
4. Step 4: Simplify right side
   91.76x = 9,810.52
5. Step 5: Solve for x
   x = 9,810.52/91.76
6. Step 6: Final answer
   x = 106.92